xfs_symlink.o \
xfs_trans.o \
xfs_utils.o \
- xfs_vnodeops.o \
xfs_xattr.o \
kmem.o \
uuid.o
#include "xfs_attr.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
-#include "xfs_vnodeops.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_trace.h"
#include "xfs_alloc.h"
#include "xfs_error.h"
#include "xfs_iomap.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
/*
int xfs_attr_inactive(struct xfs_inode *dp);
int xfs_attr_list_int(struct xfs_attr_list_context *);
int xfs_inode_hasattr(struct xfs_inode *ip);
+int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
+ unsigned char *value, int *valuelenp, int flags);
+int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
+ unsigned char *value, int valuelen, int flags);
+int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
+int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
+ int flags, struct attrlist_cursor_kern *cursor);
+
#endif /* __XFS_ATTR_H__ */
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#include "xfs_filestream.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
#include "xfs_symlink.h"
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * Copyright (c) 2012 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_trace.h"
+#include "xfs_icache.h"
/* Kernel only BMAP related definitions and functions */
return error;
}
+
+/*
+ * Test whether it is appropriate to check an inode for and free post EOF
+ * blocks. The 'force' parameter determines whether we should also consider
+ * regular files that are marked preallocated or append-only.
+ */
+bool
+xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
+{
+ /* prealloc/delalloc exists only on regular files */
+ if (!S_ISREG(ip->i_d.di_mode))
+ return false;
+
+ /*
+ * Zero sized files with no cached pages and delalloc blocks will not
+ * have speculative prealloc/delalloc blocks to remove.
+ */
+ if (VFS_I(ip)->i_size == 0 &&
+ VN_CACHED(VFS_I(ip)) == 0 &&
+ ip->i_delayed_blks == 0)
+ return false;
+
+ /* If we haven't read in the extent list, then don't do it now. */
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS))
+ return false;
+
+ /*
+ * Do not free real preallocated or append-only files unless the file
+ * has delalloc blocks and we are forced to remove them.
+ */
+ if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
+ if (!force || ip->i_delayed_blks == 0)
+ return false;
+
+ return true;
+}
+
+/*
+ * This is called by xfs_inactive to free any blocks beyond eof
+ * when the link count isn't zero and by xfs_dm_punch_hole() when
+ * punching a hole to EOF.
+ */
+int
+xfs_free_eofblocks(
+ xfs_mount_t *mp,
+ xfs_inode_t *ip,
+ bool need_iolock)
+{
+ xfs_trans_t *tp;
+ int error;
+ xfs_fileoff_t end_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_filblks_t map_len;
+ int nimaps;
+ xfs_bmbt_irec_t imap;
+
+ /*
+ * Figure out if there are any blocks beyond the end
+ * of the file. If not, then there is nothing to do.
+ */
+ end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
+ last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
+ if (last_fsb <= end_fsb)
+ return 0;
+ map_len = last_fsb - end_fsb;
+
+ nimaps = 1;
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+ error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+
+ if (!error && (nimaps != 0) &&
+ (imap.br_startblock != HOLESTARTBLOCK ||
+ ip->i_delayed_blks)) {
+ /*
+ * Attach the dquots to the inode up front.
+ */
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ /*
+ * There are blocks after the end of file.
+ * Free them up now by truncating the file to
+ * its current size.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+
+ if (need_iolock) {
+ if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
+ xfs_trans_cancel(tp, 0);
+ return EAGAIN;
+ }
+ }
+
+ error = xfs_trans_reserve(tp, 0,
+ XFS_ITRUNCATE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_ITRUNCATE_LOG_COUNT);
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ if (need_iolock)
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * Do not update the on-disk file size. If we update the
+ * on-disk file size and then the system crashes before the
+ * contents of the file are flushed to disk then the files
+ * may be full of holes (ie NULL files bug).
+ */
+ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
+ XFS_ISIZE(ip));
+ if (error) {
+ /*
+ * If we get an error at this point we simply don't
+ * bother truncating the file.
+ */
+ xfs_trans_cancel(tp,
+ (XFS_TRANS_RELEASE_LOG_RES |
+ XFS_TRANS_ABORT));
+ } else {
+ error = xfs_trans_commit(tp,
+ XFS_TRANS_RELEASE_LOG_RES);
+ if (!error)
+ xfs_inode_clear_eofblocks_tag(ip);
+ }
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (need_iolock)
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ }
+ return error;
+}
+
+/*
+ * xfs_alloc_file_space()
+ * This routine allocates disk space for the given file.
+ *
+ * If alloc_type == 0, this request is for an ALLOCSP type
+ * request which will change the file size. In this case, no
+ * DMAPI event will be generated by the call. A TRUNCATE event
+ * will be generated later by xfs_setattr.
+ *
+ * If alloc_type != 0, this request is for a RESVSP type
+ * request, and a DMAPI DM_EVENT_WRITE will be generated if the
+ * lower block boundary byte address is less than the file's
+ * length.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+STATIC int
+xfs_alloc_file_space(
+ xfs_inode_t *ip,
+ xfs_off_t offset,
+ xfs_off_t len,
+ int alloc_type,
+ int attr_flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_off_t count;
+ xfs_filblks_t allocated_fsb;
+ xfs_filblks_t allocatesize_fsb;
+ xfs_extlen_t extsz, temp;
+ xfs_fileoff_t startoffset_fsb;
+ xfs_fsblock_t firstfsb;
+ int nimaps;
+ int quota_flag;
+ int rt;
+ xfs_trans_t *tp;
+ xfs_bmbt_irec_t imaps[1], *imapp;
+ xfs_bmap_free_t free_list;
+ uint qblocks, resblks, resrtextents;
+ int committed;
+ int error;
+
+ trace_xfs_alloc_file_space(ip);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ if (len <= 0)
+ return XFS_ERROR(EINVAL);
+
+ rt = XFS_IS_REALTIME_INODE(ip);
+ extsz = xfs_get_extsz_hint(ip);
+
+ count = len;
+ imapp = &imaps[0];
+ nimaps = 1;
+ startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
+ allocatesize_fsb = XFS_B_TO_FSB(mp, count);
+
+ /*
+ * Allocate file space until done or until there is an error
+ */
+ while (allocatesize_fsb && !error) {
+ xfs_fileoff_t s, e;
+
+ /*
+ * Determine space reservations for data/realtime.
+ */
+ if (unlikely(extsz)) {
+ s = startoffset_fsb;
+ do_div(s, extsz);
+ s *= extsz;
+ e = startoffset_fsb + allocatesize_fsb;
+ if ((temp = do_mod(startoffset_fsb, extsz)))
+ e += temp;
+ if ((temp = do_mod(e, extsz)))
+ e += extsz - temp;
+ } else {
+ s = 0;
+ e = allocatesize_fsb;
+ }
+
+ /*
+ * The transaction reservation is limited to a 32-bit block
+ * count, hence we need to limit the number of blocks we are
+ * trying to reserve to avoid an overflow. We can't allocate
+ * more than @nimaps extents, and an extent is limited on disk
+ * to MAXEXTLEN (21 bits), so use that to enforce the limit.
+ */
+ resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
+ if (unlikely(rt)) {
+ resrtextents = qblocks = resblks;
+ resrtextents /= mp->m_sb.sb_rextsize;
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+ quota_flag = XFS_QMOPT_RES_RTBLKS;
+ } else {
+ resrtextents = 0;
+ resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
+ quota_flag = XFS_QMOPT_RES_REGBLKS;
+ }
+
+ /*
+ * Allocate and setup the transaction.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
+ error = xfs_trans_reserve(tp, resblks,
+ XFS_WRITE_LOG_RES(mp), resrtextents,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_WRITE_LOG_COUNT);
+ /*
+ * Check for running out of space
+ */
+ if (error) {
+ /*
+ * Free the transaction structure.
+ */
+ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ break;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
+ 0, quota_flag);
+ if (error)
+ goto error1;
+
+ xfs_trans_ijoin(tp, ip, 0);
+
+ xfs_bmap_init(&free_list, &firstfsb);
+ error = xfs_bmapi_write(tp, ip, startoffset_fsb,
+ allocatesize_fsb, alloc_type, &firstfsb,
+ 0, imapp, &nimaps, &free_list);
+ if (error) {
+ goto error0;
+ }
+
+ /*
+ * Complete the transaction
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error) {
+ goto error0;
+ }
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error) {
+ break;
+ }
+
+ allocated_fsb = imapp->br_blockcount;
+
+ if (nimaps == 0) {
+ error = XFS_ERROR(ENOSPC);
+ break;
+ }
+
+ startoffset_fsb += allocated_fsb;
+ allocatesize_fsb -= allocated_fsb;
+ }
+
+ return error;
+
+error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
+ xfs_bmap_cancel(&free_list);
+ xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
+
+error1: /* Just cancel transaction */
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+/*
+ * Zero file bytes between startoff and endoff inclusive.
+ * The iolock is held exclusive and no blocks are buffered.
+ *
+ * This function is used by xfs_free_file_space() to zero
+ * partial blocks when the range to free is not block aligned.
+ * When unreserving space with boundaries that are not block
+ * aligned we round up the start and round down the end
+ * boundaries and then use this function to zero the parts of
+ * the blocks that got dropped during the rounding.
+ */
+STATIC int
+xfs_zero_remaining_bytes(
+ xfs_inode_t *ip,
+ xfs_off_t startoff,
+ xfs_off_t endoff)
+{
+ xfs_bmbt_irec_t imap;
+ xfs_fileoff_t offset_fsb;
+ xfs_off_t lastoffset;
+ xfs_off_t offset;
+ xfs_buf_t *bp;
+ xfs_mount_t *mp = ip->i_mount;
+ int nimap;
+ int error = 0;
+
+ /*
+ * Avoid doing I/O beyond eof - it's not necessary
+ * since nothing can read beyond eof. The space will
+ * be zeroed when the file is extended anyway.
+ */
+ if (startoff >= XFS_ISIZE(ip))
+ return 0;
+
+ if (endoff > XFS_ISIZE(ip))
+ endoff = XFS_ISIZE(ip);
+
+ bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
+ mp->m_rtdev_targp : mp->m_ddev_targp,
+ BTOBB(mp->m_sb.sb_blocksize), 0);
+ if (!bp)
+ return XFS_ERROR(ENOMEM);
+
+ xfs_buf_unlock(bp);
+
+ for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ nimap = 1;
+ error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
+ if (error || nimap < 1)
+ break;
+ ASSERT(imap.br_blockcount >= 1);
+ ASSERT(imap.br_startoff == offset_fsb);
+ lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
+ if (lastoffset > endoff)
+ lastoffset = endoff;
+ if (imap.br_startblock == HOLESTARTBLOCK)
+ continue;
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ if (imap.br_state == XFS_EXT_UNWRITTEN)
+ continue;
+ XFS_BUF_UNDONE(bp);
+ XFS_BUF_UNWRITE(bp);
+ XFS_BUF_READ(bp);
+ XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
+ xfsbdstrat(mp, bp);
+ error = xfs_buf_iowait(bp);
+ if (error) {
+ xfs_buf_ioerror_alert(bp,
+ "xfs_zero_remaining_bytes(read)");
+ break;
+ }
+ memset(bp->b_addr +
+ (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
+ 0, lastoffset - offset + 1);
+ XFS_BUF_UNDONE(bp);
+ XFS_BUF_UNREAD(bp);
+ XFS_BUF_WRITE(bp);
+ xfsbdstrat(mp, bp);
+ error = xfs_buf_iowait(bp);
+ if (error) {
+ xfs_buf_ioerror_alert(bp,
+ "xfs_zero_remaining_bytes(write)");
+ break;
+ }
+ }
+ xfs_buf_free(bp);
+ return error;
+}
+
+/*
+ * xfs_free_file_space()
+ * This routine frees disk space for the given file.
+ *
+ * This routine is only called by xfs_change_file_space
+ * for an UNRESVSP type call.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+STATIC int
+xfs_free_file_space(
+ xfs_inode_t *ip,
+ xfs_off_t offset,
+ xfs_off_t len,
+ int attr_flags)
+{
+ int committed;
+ int done;
+ xfs_fileoff_t endoffset_fsb;
+ int error;
+ xfs_fsblock_t firstfsb;
+ xfs_bmap_free_t free_list;
+ xfs_bmbt_irec_t imap;
+ xfs_off_t ioffset;
+ xfs_extlen_t mod=0;
+ xfs_mount_t *mp;
+ int nimap;
+ uint resblks;
+ xfs_off_t rounding;
+ int rt;
+ xfs_fileoff_t startoffset_fsb;
+ xfs_trans_t *tp;
+ int need_iolock = 1;
+
+ mp = ip->i_mount;
+
+ trace_xfs_free_file_space(ip);
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+
+ error = 0;
+ if (len <= 0) /* if nothing being freed */
+ return error;
+ rt = XFS_IS_REALTIME_INODE(ip);
+ startoffset_fsb = XFS_B_TO_FSB(mp, offset);
+ endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
+
+ if (attr_flags & XFS_ATTR_NOLOCK)
+ need_iolock = 0;
+ if (need_iolock) {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ /* wait for the completion of any pending DIOs */
+ inode_dio_wait(VFS_I(ip));
+ }
+
+ rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
+ ioffset = offset & ~(rounding - 1);
+ error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
+ ioffset, -1);
+ if (error)
+ goto out_unlock_iolock;
+ truncate_pagecache_range(VFS_I(ip), ioffset, -1);
+
+ /*
+ * Need to zero the stuff we're not freeing, on disk.
+ * If it's a realtime file & can't use unwritten extents then we
+ * actually need to zero the extent edges. Otherwise xfs_bunmapi
+ * will take care of it for us.
+ */
+ if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
+ nimap = 1;
+ error = xfs_bmapi_read(ip, startoffset_fsb, 1,
+ &imap, &nimap, 0);
+ if (error)
+ goto out_unlock_iolock;
+ ASSERT(nimap == 0 || nimap == 1);
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ xfs_daddr_t block;
+
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ block = imap.br_startblock;
+ mod = do_div(block, mp->m_sb.sb_rextsize);
+ if (mod)
+ startoffset_fsb += mp->m_sb.sb_rextsize - mod;
+ }
+ nimap = 1;
+ error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
+ &imap, &nimap, 0);
+ if (error)
+ goto out_unlock_iolock;
+ ASSERT(nimap == 0 || nimap == 1);
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ mod++;
+ if (mod && (mod != mp->m_sb.sb_rextsize))
+ endoffset_fsb -= mod;
+ }
+ }
+ if ((done = (endoffset_fsb <= startoffset_fsb)))
+ /*
+ * One contiguous piece to clear
+ */
+ error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
+ else {
+ /*
+ * Some full blocks, possibly two pieces to clear
+ */
+ if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
+ error = xfs_zero_remaining_bytes(ip, offset,
+ XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
+ if (!error &&
+ XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
+ error = xfs_zero_remaining_bytes(ip,
+ XFS_FSB_TO_B(mp, endoffset_fsb),
+ offset + len - 1);
+ }
+
+ /*
+ * free file space until done or until there is an error
+ */
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+ while (!error && !done) {
+
+ /*
+ * allocate and setup the transaction. Allow this
+ * transaction to dip into the reserve blocks to ensure
+ * the freeing of the space succeeds at ENOSPC.
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
+ tp->t_flags |= XFS_TRANS_RESERVE;
+ error = xfs_trans_reserve(tp,
+ resblks,
+ XFS_WRITE_LOG_RES(mp),
+ 0,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_WRITE_LOG_COUNT);
+
+ /*
+ * check for running out of space
+ */
+ if (error) {
+ /*
+ * Free the transaction structure.
+ */
+ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ break;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota(tp, mp,
+ ip->i_udquot, ip->i_gdquot, ip->i_pdquot,
+ resblks, 0, XFS_QMOPT_RES_REGBLKS);
+ if (error)
+ goto error1;
+
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * issue the bunmapi() call to free the blocks
+ */
+ xfs_bmap_init(&free_list, &firstfsb);
+ error = xfs_bunmapi(tp, ip, startoffset_fsb,
+ endoffset_fsb - startoffset_fsb,
+ 0, 2, &firstfsb, &free_list, &done);
+ if (error) {
+ goto error0;
+ }
+
+ /*
+ * complete the transaction
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error) {
+ goto error0;
+ }
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ out_unlock_iolock:
+ if (need_iolock)
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+
+ error0:
+ xfs_bmap_cancel(&free_list);
+ error1:
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
+ XFS_ILOCK_EXCL);
+ return error;
+}
+
+
+STATIC int
+xfs_zero_file_space(
+ struct xfs_inode *ip,
+ xfs_off_t offset,
+ xfs_off_t len,
+ int attr_flags)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ uint granularity;
+ xfs_off_t start_boundary;
+ xfs_off_t end_boundary;
+ int error;
+
+ granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
+
+ /*
+ * Round the range of extents we are going to convert inwards. If the
+ * offset is aligned, then it doesn't get changed so we zero from the
+ * start of the block offset points to.
+ */
+ start_boundary = round_up(offset, granularity);
+ end_boundary = round_down(offset + len, granularity);
+
+ ASSERT(start_boundary >= offset);
+ ASSERT(end_boundary <= offset + len);
+
+ if (!(attr_flags & XFS_ATTR_NOLOCK))
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+
+ if (start_boundary < end_boundary - 1) {
+ /* punch out the page cache over the conversion range */
+ truncate_pagecache_range(VFS_I(ip), start_boundary,
+ end_boundary - 1);
+ /* convert the blocks */
+ error = xfs_alloc_file_space(ip, start_boundary,
+ end_boundary - start_boundary - 1,
+ XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT,
+ attr_flags);
+ if (error)
+ goto out_unlock;
+
+ /* We've handled the interior of the range, now for the edges */
+ if (start_boundary != offset)
+ error = xfs_iozero(ip, offset, start_boundary - offset);
+ if (error)
+ goto out_unlock;
+
+ if (end_boundary != offset + len)
+ error = xfs_iozero(ip, end_boundary,
+ offset + len - end_boundary);
+
+ } else {
+ /*
+ * It's either a sub-granularity range or the range spanned lies
+ * partially across two adjacent blocks.
+ */
+ error = xfs_iozero(ip, offset, len);
+ }
+
+out_unlock:
+ if (!(attr_flags & XFS_ATTR_NOLOCK))
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return error;
+
+}
+
+/*
+ * xfs_change_file_space()
+ * This routine allocates or frees disk space for the given file.
+ * The user specified parameters are checked for alignment and size
+ * limitations.
+ *
+ * RETURNS:
+ * 0 on success
+ * errno on error
+ *
+ */
+int
+xfs_change_file_space(
+ xfs_inode_t *ip,
+ int cmd,
+ xfs_flock64_t *bf,
+ xfs_off_t offset,
+ int attr_flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int clrprealloc;
+ int error;
+ xfs_fsize_t fsize;
+ int setprealloc;
+ xfs_off_t startoffset;
+ xfs_trans_t *tp;
+ struct iattr iattr;
+
+ if (!S_ISREG(ip->i_d.di_mode))
+ return XFS_ERROR(EINVAL);
+
+ switch (bf->l_whence) {
+ case 0: /*SEEK_SET*/
+ break;
+ case 1: /*SEEK_CUR*/
+ bf->l_start += offset;
+ break;
+ case 2: /*SEEK_END*/
+ bf->l_start += XFS_ISIZE(ip);
+ break;
+ default:
+ return XFS_ERROR(EINVAL);
+ }
+
+ /*
+ * length of <= 0 for resv/unresv/zero is invalid. length for
+ * alloc/free is ignored completely and we have no idea what userspace
+ * might have set it to, so set it to zero to allow range
+ * checks to pass.
+ */
+ switch (cmd) {
+ case XFS_IOC_ZERO_RANGE:
+ case XFS_IOC_RESVSP:
+ case XFS_IOC_RESVSP64:
+ case XFS_IOC_UNRESVSP:
+ case XFS_IOC_UNRESVSP64:
+ if (bf->l_len <= 0)
+ return XFS_ERROR(EINVAL);
+ break;
+ default:
+ bf->l_len = 0;
+ break;
+ }
+
+ if (bf->l_start < 0 ||
+ bf->l_start > mp->m_super->s_maxbytes ||
+ bf->l_start + bf->l_len < 0 ||
+ bf->l_start + bf->l_len >= mp->m_super->s_maxbytes)
+ return XFS_ERROR(EINVAL);
+
+ bf->l_whence = 0;
+
+ startoffset = bf->l_start;
+ fsize = XFS_ISIZE(ip);
+
+ setprealloc = clrprealloc = 0;
+ switch (cmd) {
+ case XFS_IOC_ZERO_RANGE:
+ error = xfs_zero_file_space(ip, startoffset, bf->l_len,
+ attr_flags);
+ if (error)
+ return error;
+ setprealloc = 1;
+ break;
+
+ case XFS_IOC_RESVSP:
+ case XFS_IOC_RESVSP64:
+ error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
+ XFS_BMAPI_PREALLOC, attr_flags);
+ if (error)
+ return error;
+ setprealloc = 1;
+ break;
+
+ case XFS_IOC_UNRESVSP:
+ case XFS_IOC_UNRESVSP64:
+ if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
+ attr_flags)))
+ return error;
+ break;
+
+ case XFS_IOC_ALLOCSP:
+ case XFS_IOC_ALLOCSP64:
+ case XFS_IOC_FREESP:
+ case XFS_IOC_FREESP64:
+ /*
+ * These operations actually do IO when extending the file, but
+ * the allocation is done seperately to the zeroing that is
+ * done. This set of operations need to be serialised against
+ * other IO operations, such as truncate and buffered IO. We
+ * need to take the IOLOCK here to serialise the allocation and
+ * zeroing IO to prevent other IOLOCK holders (e.g. getbmap,
+ * truncate, direct IO) from racing against the transient
+ * allocated but not written state we can have here.
+ */
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ if (startoffset > fsize) {
+ error = xfs_alloc_file_space(ip, fsize,
+ startoffset - fsize, 0,
+ attr_flags | XFS_ATTR_NOLOCK);
+ if (error) {
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ break;
+ }
+ }
+
+ iattr.ia_valid = ATTR_SIZE;
+ iattr.ia_size = startoffset;
+
+ error = xfs_setattr_size(ip, &iattr,
+ attr_flags | XFS_ATTR_NOLOCK);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+
+ if (error)
+ return error;
+
+ clrprealloc = 1;
+ break;
+
+ default:
+ ASSERT(0);
+ return XFS_ERROR(EINVAL);
+ }
+
+ /*
+ * update the inode timestamp, mode, and prealloc flag bits
+ */
+ tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
+
+ if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
+ 0, 0, 0))) {
+ /* ASSERT(0); */
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ if ((attr_flags & XFS_ATTR_DMI) == 0) {
+ ip->i_d.di_mode &= ~S_ISUID;
+
+ /*
+ * Note that we don't have to worry about mandatory
+ * file locking being disabled here because we only
+ * clear the S_ISGID bit if the Group execute bit is
+ * on, but if it was on then mandatory locking wouldn't
+ * have been enabled.
+ */
+ if (ip->i_d.di_mode & S_IXGRP)
+ ip->i_d.di_mode &= ~S_ISGID;
+
+ xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ }
+ if (setprealloc)
+ ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
+ else if (clrprealloc)
+ ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ if (attr_flags & XFS_ATTR_SYNC)
+ xfs_trans_set_sync(tp);
+ return xfs_trans_commit(tp, 0);
+}
/* Kernel only BMAP related definitions and functions */
struct xfs_bmbt_irec;
+struct xfs_bmap_free_item;
struct xfs_ifork;
struct xfs_inode;
struct xfs_mount;
int whichfork, struct xfs_bmbt_irec *rec,
int *is_empty);
+/* preallocation and hole punch interface */
+int xfs_change_file_space(struct xfs_inode *ip, int cmd,
+ xfs_flock64_t *bf, xfs_off_t offset,
+ int attr_flags);
+
+/* EOF block manipulation functions */
+bool xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
+int xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
+ bool need_iolock);
+
xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
#endif /* __XFS_BMAP_UTIL_H__ */
#include "xfs_itable.h"
#include "xfs_dfrag.h"
#include "xfs_error.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_error.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
*/
extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
-/*
- * Direct call on directory open, before entering the readdir code.
- */
-extern int xfs_dir3_data_readahead(struct xfs_trans *tp, struct xfs_inode *dp,
- xfs_dablk_t bno, xfs_daddr_t mapped_bno);
-
/*
* Interface routines used by userspace utilities
*/
extern int __xfs_dir3_data_check(struct xfs_inode *dp, struct xfs_buf *bp);
extern int xfs_dir3_data_read(struct xfs_trans *tp, struct xfs_inode *dp,
xfs_dablk_t bno, xfs_daddr_t mapped_bno, struct xfs_buf **bpp);
+extern int xfs_dir3_data_readahead(struct xfs_trans *tp, struct xfs_inode *dp,
+ xfs_dablk_t bno, xfs_daddr_t mapped_bno);
extern struct xfs_dir2_data_free *
xfs_dir2_data_freeinsert(struct xfs_dir2_data_hdr *hdr,
extern int xfs_dir2_sf_removename(struct xfs_da_args *args);
extern int xfs_dir2_sf_replace(struct xfs_da_args *args);
+/* xfs_dir2_readdir.c */
+extern int xfs_readdir(struct xfs_inode *dp, struct dir_context *ctx,
+ size_t bufsize);
+
#endif /* __XFS_DIR2_PRIV_H__ */
#include "xfs_dir2_format.h"
#include "xfs_dir2.h"
#include "xfs_export.h"
-#include "xfs_vnodeops.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
#include "xfs_error.h"
-#include "xfs_vnodeops.h"
#include "xfs_da_btree.h"
#include "xfs_dir2_format.h"
#include "xfs_dir2.h"
+#include "xfs_dir2_priv.h"
#include "xfs_ioctl.h"
#include "xfs_trace.h"
#include "xfs_dinode.h"
#include "xfs_error.h"
#include "xfs_filestream.h"
-#include "xfs_vnodeops.h"
#include "xfs_inode_item.h"
#include "xfs_quota.h"
#include "xfs_trace.h"
#include "xfs_fsops.h"
#include "xfs_icache.h"
+#include "xfs_bmap_util.h"
#include <linux/kthread.h>
#include <linux/freezer.h>
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
+#include "xfs_trans_space.h"
#include "xfs_trans_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir2_format.h"
+#include "xfs_dir2.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_attr_sf.h"
+#include "xfs_attr.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_quota.h"
#include "xfs_filestream.h"
-#include "xfs_vnodeops.h"
#include "xfs_cksum.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
+#include "xfs_symlink.h"
kmem_zone_t *xfs_inode_zone;
}
#endif
+#ifdef DEBUG
+int xfs_locked_n;
+int xfs_small_retries;
+int xfs_middle_retries;
+int xfs_lots_retries;
+int xfs_lock_delays;
+#endif
+
+/*
+ * Bump the subclass so xfs_lock_inodes() acquires each lock with
+ * a different value
+ */
+static inline int
+xfs_lock_inumorder(int lock_mode, int subclass)
+{
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
+ if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
+
+ return lock_mode;
+}
+
+/*
+ * The following routine will lock n inodes in exclusive mode.
+ * We assume the caller calls us with the inodes in i_ino order.
+ *
+ * We need to detect deadlock where an inode that we lock
+ * is in the AIL and we start waiting for another inode that is locked
+ * by a thread in a long running transaction (such as truncate). This can
+ * result in deadlock since the long running trans might need to wait
+ * for the inode we just locked in order to push the tail and free space
+ * in the log.
+ */
+void
+xfs_lock_inodes(
+ xfs_inode_t **ips,
+ int inodes,
+ uint lock_mode)
+{
+ int attempts = 0, i, j, try_lock;
+ xfs_log_item_t *lp;
+
+ ASSERT(ips && (inodes >= 2)); /* we need at least two */
+
+ try_lock = 0;
+ i = 0;
+
+again:
+ for (; i < inodes; i++) {
+ ASSERT(ips[i]);
+
+ if (i && (ips[i] == ips[i-1])) /* Already locked */
+ continue;
+
+ /*
+ * If try_lock is not set yet, make sure all locked inodes
+ * are not in the AIL.
+ * If any are, set try_lock to be used later.
+ */
+
+ if (!try_lock) {
+ for (j = (i - 1); j >= 0 && !try_lock; j--) {
+ lp = (xfs_log_item_t *)ips[j]->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ try_lock++;
+ }
+ }
+ }
+
+ /*
+ * If any of the previous locks we have locked is in the AIL,
+ * we must TRY to get the second and subsequent locks. If
+ * we can't get any, we must release all we have
+ * and try again.
+ */
+
+ if (try_lock) {
+ /* try_lock must be 0 if i is 0. */
+ /*
+ * try_lock means we have an inode locked
+ * that is in the AIL.
+ */
+ ASSERT(i != 0);
+ if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
+ attempts++;
+
+ /*
+ * Unlock all previous guys and try again.
+ * xfs_iunlock will try to push the tail
+ * if the inode is in the AIL.
+ */
+
+ for(j = i - 1; j >= 0; j--) {
+
+ /*
+ * Check to see if we've already
+ * unlocked this one.
+ * Not the first one going back,
+ * and the inode ptr is the same.
+ */
+ if ((j != (i - 1)) && ips[j] ==
+ ips[j+1])
+ continue;
+
+ xfs_iunlock(ips[j], lock_mode);
+ }
+
+ if ((attempts % 5) == 0) {
+ delay(1); /* Don't just spin the CPU */
+#ifdef DEBUG
+ xfs_lock_delays++;
+#endif
+ }
+ i = 0;
+ try_lock = 0;
+ goto again;
+ }
+ } else {
+ xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
+ }
+ }
+
+#ifdef DEBUG
+ if (attempts) {
+ if (attempts < 5) xfs_small_retries++;
+ else if (attempts < 100) xfs_middle_retries++;
+ else xfs_lots_retries++;
+ } else {
+ xfs_locked_n++;
+ }
+#endif
+}
+
+/*
+ * xfs_lock_two_inodes() can only be used to lock one type of lock
+ * at a time - the iolock or the ilock, but not both at once. If
+ * we lock both at once, lockdep will report false positives saying
+ * we have violated locking orders.
+ */
+void
+xfs_lock_two_inodes(
+ xfs_inode_t *ip0,
+ xfs_inode_t *ip1,
+ uint lock_mode)
+{
+ xfs_inode_t *temp;
+ int attempts = 0;
+ xfs_log_item_t *lp;
+
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
+ ASSERT(ip0->i_ino != ip1->i_ino);
+
+ if (ip0->i_ino > ip1->i_ino) {
+ temp = ip0;
+ ip0 = ip1;
+ ip1 = temp;
+ }
+
+ again:
+ xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
+
+ /*
+ * If the first lock we have locked is in the AIL, we must TRY to get
+ * the second lock. If we can't get it, we must release the first one
+ * and try again.
+ */
+ lp = (xfs_log_item_t *)ip0->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
+ xfs_iunlock(ip0, lock_mode);
+ if ((++attempts % 5) == 0)
+ delay(1); /* Don't just spin the CPU */
+ goto again;
+ }
+ } else {
+ xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
+ }
+}
+
+
void
__xfs_iflock(
struct xfs_inode *ip)
(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
}
+/*
+ * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
+ * is allowed, otherwise it has to be an exact match. If a CI match is found,
+ * ci_name->name will point to a the actual name (caller must free) or
+ * will be set to NULL if an exact match is found.
+ */
+int
+xfs_lookup(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t **ipp,
+ struct xfs_name *ci_name)
+{
+ xfs_ino_t inum;
+ int error;
+ uint lock_mode;
+
+ trace_xfs_lookup(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(dp->i_mount))
+ return XFS_ERROR(EIO);
+
+ lock_mode = xfs_ilock_map_shared(dp);
+ error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
+ xfs_iunlock_map_shared(dp, lock_mode);
+
+ if (error)
+ goto out;
+
+ error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
+ if (error)
+ goto out_free_name;
+
+ return 0;
+
+out_free_name:
+ if (ci_name)
+ kmem_free(ci_name->name);
+out:
+ *ipp = NULL;
+ return error;
+}
+
/*
* Allocate an inode on disk and return a copy of its in-core version.
* The in-core inode is locked exclusively. Set mode, nlink, and rdev
return 0;
}
+int
+xfs_create(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ umode_t mode,
+ xfs_dev_t rdev,
+ xfs_inode_t **ipp)
+{
+ int is_dir = S_ISDIR(mode);
+ struct xfs_mount *mp = dp->i_mount;
+ struct xfs_inode *ip = NULL;
+ struct xfs_trans *tp = NULL;
+ int error;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ bool unlock_dp_on_error = false;
+ uint cancel_flags;
+ int committed;
+ prid_t prid;
+ struct xfs_dquot *udqp = NULL;
+ struct xfs_dquot *gdqp = NULL;
+ struct xfs_dquot *pdqp = NULL;
+ uint resblks;
+ uint log_res;
+ uint log_count;
+
+ trace_xfs_create(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
+ prid = xfs_get_projid(dp);
+ else
+ prid = XFS_PROJID_DEFAULT;
+
+ /*
+ * Make sure that we have allocated dquot(s) on disk.
+ */
+ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
+ XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+ &udqp, &gdqp, &pdqp);
+ if (error)
+ return error;
+
+ if (is_dir) {
+ rdev = 0;
+ resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
+ log_res = XFS_MKDIR_LOG_RES(mp);
+ log_count = XFS_MKDIR_LOG_COUNT;
+ tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
+ } else {
+ resblks = XFS_CREATE_SPACE_RES(mp, name->len);
+ log_res = XFS_CREATE_LOG_RES(mp);
+ log_count = XFS_CREATE_LOG_COUNT;
+ tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
+ }
+
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+
+ /*
+ * Initially assume that the file does not exist and
+ * reserve the resources for that case. If that is not
+ * the case we'll drop the one we have and get a more
+ * appropriate transaction later.
+ */
+ error = xfs_trans_reserve(tp, resblks, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ if (error == ENOSPC) {
+ /* flush outstanding delalloc blocks and retry */
+ xfs_flush_inodes(mp);
+ error = xfs_trans_reserve(tp, resblks, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error == ENOSPC) {
+ /* No space at all so try a "no-allocation" reservation */
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, log_res, 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error) {
+ cancel_flags = 0;
+ goto out_trans_cancel;
+ }
+
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
+ unlock_dp_on_error = true;
+
+ xfs_bmap_init(&free_list, &first_block);
+
+ /*
+ * Reserve disk quota and the inode.
+ */
+ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
+ pdqp, resblks, 1, 0);
+ if (error)
+ goto out_trans_cancel;
+
+ error = xfs_dir_canenter(tp, dp, name, resblks);
+ if (error)
+ goto out_trans_cancel;
+
+ /*
+ * A newly created regular or special file just has one directory
+ * entry pointing to them, but a directory also the "." entry
+ * pointing to itself.
+ */
+ error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
+ prid, resblks > 0, &ip, &committed);
+ if (error) {
+ if (error == ENOSPC)
+ goto out_trans_cancel;
+ goto out_trans_abort;
+ }
+
+ /*
+ * Now we join the directory inode to the transaction. We do not do it
+ * earlier because xfs_dir_ialloc might commit the previous transaction
+ * (and release all the locks). An error from here on will result in
+ * the transaction cancel unlocking dp so don't do it explicitly in the
+ * error path.
+ */
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ unlock_dp_on_error = false;
+
+ error = xfs_dir_createname(tp, dp, name, ip->i_ino,
+ &first_block, &free_list, resblks ?
+ resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
+ if (error) {
+ ASSERT(error != ENOSPC);
+ goto out_trans_abort;
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+ if (is_dir) {
+ error = xfs_dir_init(tp, ip, dp);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_bumplink(tp, dp);
+ if (error)
+ goto out_bmap_cancel;
+ }
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * create transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ /*
+ * Attach the dquot(s) to the inodes and modify them incore.
+ * These ids of the inode couldn't have changed since the new
+ * inode has been locked ever since it was created.
+ */
+ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
+
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ goto out_release_inode;
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ *ipp = ip;
+ return 0;
+
+ out_bmap_cancel:
+ xfs_bmap_cancel(&free_list);
+ out_trans_abort:
+ cancel_flags |= XFS_TRANS_ABORT;
+ out_trans_cancel:
+ xfs_trans_cancel(tp, cancel_flags);
+ out_release_inode:
+ /*
+ * Wait until after the current transaction is aborted to
+ * release the inode. This prevents recursive transactions
+ * and deadlocks from xfs_inactive.
+ */
+ if (ip)
+ IRELE(ip);
+
+ xfs_qm_dqrele(udqp);
+ xfs_qm_dqrele(gdqp);
+ xfs_qm_dqrele(pdqp);
+
+ if (unlock_dp_on_error)
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
+ return error;
+}
+
+int
+xfs_link(
+ xfs_inode_t *tdp,
+ xfs_inode_t *sip,
+ struct xfs_name *target_name)
+{
+ xfs_mount_t *mp = tdp->i_mount;
+ xfs_trans_t *tp;
+ int error;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int cancel_flags;
+ int committed;
+ int resblks;
+
+ trace_xfs_link(tdp, target_name);
+
+ ASSERT(!S_ISDIR(sip->i_d.di_mode));
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(sip, 0);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(tdp, 0);
+ if (error)
+ goto std_return;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+ resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
+ error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
+ if (error == ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
+ }
+ if (error) {
+ cancel_flags = 0;
+ goto error_return;
+ }
+
+ xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
+
+ /*
+ * If we are using project inheritance, we only allow hard link
+ * creation in our tree when the project IDs are the same; else
+ * the tree quota mechanism could be circumvented.
+ */
+ if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
+ (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
+ error = XFS_ERROR(EXDEV);
+ goto error_return;
+ }
+
+ error = xfs_dir_canenter(tp, tdp, target_name, resblks);
+ if (error)
+ goto error_return;
+
+ xfs_bmap_init(&free_list, &first_block);
+
+ error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
+ &first_block, &free_list, resblks);
+ if (error)
+ goto abort_return;
+ xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
+
+ error = xfs_bumplink(tp, sip);
+ if (error)
+ goto abort_return;
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * link transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
+ xfs_trans_set_sync(tp);
+ }
+
+ error = xfs_bmap_finish (&tp, &free_list, &committed);
+ if (error) {
+ xfs_bmap_cancel(&free_list);
+ goto abort_return;
+ }
+
+ return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+
+ abort_return:
+ cancel_flags |= XFS_TRANS_ABORT;
+ error_return:
+ xfs_trans_cancel(tp, cancel_flags);
+ std_return:
+ return error;
+}
+
/*
* Free up the underlying blocks past new_size. The new size must be smaller
* than the current size. This routine can be used both for the attribute and
goto out;
}
+int
+xfs_release(
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ int error;
+
+ if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
+ return 0;
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ return 0;
+
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ int truncated;
+
+ /*
+ * If we are using filestreams, and we have an unlinked
+ * file that we are processing the last close on, then nothing
+ * will be able to reopen and write to this file. Purge this
+ * inode from the filestreams cache so that it doesn't delay
+ * teardown of the inode.
+ */
+ if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
+ xfs_filestream_deassociate(ip);
+
+ /*
+ * If we previously truncated this file and removed old data
+ * in the process, we want to initiate "early" writeout on
+ * the last close. This is an attempt to combat the notorious
+ * NULL files problem which is particularly noticeable from a
+ * truncate down, buffered (re-)write (delalloc), followed by
+ * a crash. What we are effectively doing here is
+ * significantly reducing the time window where we'd otherwise
+ * be exposed to that problem.
+ */
+ truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
+ if (truncated) {
+ xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
+ if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0) {
+ error = -filemap_flush(VFS_I(ip)->i_mapping);
+ if (error)
+ return error;
+ }
+ }
+ }
+
+ if (ip->i_d.di_nlink == 0)
+ return 0;
+
+ if (xfs_can_free_eofblocks(ip, false)) {
+
+ /*
+ * If we can't get the iolock just skip truncating the blocks
+ * past EOF because we could deadlock with the mmap_sem
+ * otherwise. We'll get another chance to drop them once the
+ * last reference to the inode is dropped, so we'll never leak
+ * blocks permanently.
+ *
+ * Further, check if the inode is being opened, written and
+ * closed frequently and we have delayed allocation blocks
+ * outstanding (e.g. streaming writes from the NFS server),
+ * truncating the blocks past EOF will cause fragmentation to
+ * occur.
+ *
+ * In this case don't do the truncation, either, but we have to
+ * be careful how we detect this case. Blocks beyond EOF show
+ * up as i_delayed_blks even when the inode is clean, so we
+ * need to truncate them away first before checking for a dirty
+ * release. Hence on the first dirty close we will still remove
+ * the speculative allocation, but after that we will leave it
+ * in place.
+ */
+ if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
+ return 0;
+
+ error = xfs_free_eofblocks(mp, ip, true);
+ if (error && error != EAGAIN)
+ return error;
+
+ /* delalloc blocks after truncation means it really is dirty */
+ if (ip->i_delayed_blks)
+ xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
+ }
+ return 0;
+}
+
+/*
+ * xfs_inactive
+ *
+ * This is called when the vnode reference count for the vnode
+ * goes to zero. If the file has been unlinked, then it must
+ * now be truncated. Also, we clear all of the read-ahead state
+ * kept for the inode here since the file is now closed.
+ */
+int
+xfs_inactive(
+ xfs_inode_t *ip)
+{
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int committed;
+ xfs_trans_t *tp;
+ xfs_mount_t *mp;
+ int error;
+ int truncate = 0;
+
+ /*
+ * If the inode is already free, then there can be nothing
+ * to clean up here.
+ */
+ if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
+ ASSERT(ip->i_df.if_real_bytes == 0);
+ ASSERT(ip->i_df.if_broot_bytes == 0);
+ return VN_INACTIVE_CACHE;
+ }
+
+ mp = ip->i_mount;
+
+ error = 0;
+
+ /* If this is a read-only mount, don't do this (would generate I/O) */
+ if (mp->m_flags & XFS_MOUNT_RDONLY)
+ goto out;
+
+ if (ip->i_d.di_nlink != 0) {
+ /*
+ * force is true because we are evicting an inode from the
+ * cache. Post-eof blocks must be freed, lest we end up with
+ * broken free space accounting.
+ */
+ if (xfs_can_free_eofblocks(ip, true)) {
+ error = xfs_free_eofblocks(mp, ip, false);
+ if (error)
+ return VN_INACTIVE_CACHE;
+ }
+ goto out;
+ }
+
+ if (S_ISREG(ip->i_d.di_mode) &&
+ (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
+ ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
+ truncate = 1;
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return VN_INACTIVE_CACHE;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+ error = xfs_trans_reserve(tp, 0,
+ (truncate || S_ISLNK(ip->i_d.di_mode)) ?
+ XFS_ITRUNCATE_LOG_RES(mp) :
+ XFS_IFREE_LOG_RES(mp),
+ 0,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_ITRUNCATE_LOG_COUNT);
+ if (error) {
+ ASSERT(XFS_FORCED_SHUTDOWN(mp));
+ xfs_trans_cancel(tp, 0);
+ return VN_INACTIVE_CACHE;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ if (S_ISLNK(ip->i_d.di_mode)) {
+ error = xfs_inactive_symlink(ip, &tp);
+ if (error)
+ goto out_cancel;
+ } else if (truncate) {
+ ip->i_d.di_size = 0;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
+ if (error)
+ goto out_cancel;
+
+ ASSERT(ip->i_d.di_nextents == 0);
+ }
+
+ /*
+ * If there are attributes associated with the file then blow them away
+ * now. The code calls a routine that recursively deconstructs the
+ * attribute fork. We need to just commit the current transaction
+ * because we can't use it for xfs_attr_inactive().
+ */
+ if (ip->i_d.di_anextents > 0) {
+ ASSERT(ip->i_d.di_forkoff != 0);
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ goto out_unlock;
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ error = xfs_attr_inactive(ip);
+ if (error)
+ goto out;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+ error = xfs_trans_reserve(tp, 0,
+ XFS_IFREE_LOG_RES(mp),
+ 0, XFS_TRANS_PERM_LOG_RES,
+ XFS_INACTIVE_LOG_COUNT);
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ goto out;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+ }
+
+ if (ip->i_afp)
+ xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+
+ ASSERT(ip->i_d.di_anextents == 0);
+
+ /*
+ * Free the inode.
+ */
+ xfs_bmap_init(&free_list, &first_block);
+ error = xfs_ifree(tp, ip, &free_list);
+ if (error) {
+ /*
+ * If we fail to free the inode, shut down. The cancel
+ * might do that, we need to make sure. Otherwise the
+ * inode might be lost for a long time or forever.
+ */
+ if (!XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_notice(mp, "%s: xfs_ifree returned error %d",
+ __func__, error);
+ xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+ }
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+ } else {
+ /*
+ * Credit the quota account(s). The inode is gone.
+ */
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
+
+ /*
+ * Just ignore errors at this point. There is nothing we can
+ * do except to try to keep going. Make sure it's not a silent
+ * error.
+ */
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
+ __func__, error);
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
+ __func__, error);
+ }
+
+ /*
+ * Release the dquots held by inode, if any.
+ */
+ xfs_qm_dqdetach(ip);
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+out:
+ return VN_INACTIVE_CACHE;
+out_cancel:
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ goto out_unlock;
+}
+
/*
* This is called when the inode's link count goes to 0.
* We place the on-disk inode on a list in the AGI. It
__xfs_iunpin_wait(ip);
}
+int
+xfs_remove(
+ xfs_inode_t *dp,
+ struct xfs_name *name,
+ xfs_inode_t *ip)
+{
+ xfs_mount_t *mp = dp->i_mount;
+ xfs_trans_t *tp = NULL;
+ int is_dir = S_ISDIR(ip->i_d.di_mode);
+ int error = 0;
+ xfs_bmap_free_t free_list;
+ xfs_fsblock_t first_block;
+ int cancel_flags;
+ int committed;
+ int link_zero;
+ uint resblks;
+ uint log_count;
+
+ trace_xfs_remove(dp, name);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ error = xfs_qm_dqattach(dp, 0);
+ if (error)
+ goto std_return;
+
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ goto std_return;
+
+ if (is_dir) {
+ tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
+ log_count = XFS_DEFAULT_LOG_COUNT;
+ } else {
+ tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
+ log_count = XFS_REMOVE_LOG_COUNT;
+ }
+ cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+
+ /*
+ * We try to get the real space reservation first,
+ * allowing for directory btree deletion(s) implying
+ * possible bmap insert(s). If we can't get the space
+ * reservation then we use 0 instead, and avoid the bmap
+ * btree insert(s) in the directory code by, if the bmap
+ * insert tries to happen, instead trimming the LAST
+ * block from the directory.
+ */
+ resblks = XFS_REMOVE_SPACE_RES(mp);
+ error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ if (error == ENOSPC) {
+ resblks = 0;
+ error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES, log_count);
+ }
+ if (error) {
+ ASSERT(error != ENOSPC);
+ cancel_flags = 0;
+ goto out_trans_cancel;
+ }
+
+ xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ /*
+ * If we're removing a directory perform some additional validation.
+ */
+ if (is_dir) {
+ ASSERT(ip->i_d.di_nlink >= 2);
+ if (ip->i_d.di_nlink != 2) {
+ error = XFS_ERROR(ENOTEMPTY);
+ goto out_trans_cancel;
+ }
+ if (!xfs_dir_isempty(ip)) {
+ error = XFS_ERROR(ENOTEMPTY);
+ goto out_trans_cancel;
+ }
+ }
+
+ xfs_bmap_init(&free_list, &first_block);
+ error = xfs_dir_removename(tp, dp, name, ip->i_ino,
+ &first_block, &free_list, resblks);
+ if (error) {
+ ASSERT(error != ENOENT);
+ goto out_bmap_cancel;
+ }
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+
+ if (is_dir) {
+ /*
+ * Drop the link from ip's "..".
+ */
+ error = xfs_droplink(tp, dp);
+ if (error)
+ goto out_bmap_cancel;
+
+ /*
+ * Drop the "." link from ip to self.
+ */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_bmap_cancel;
+ } else {
+ /*
+ * When removing a non-directory we need to log the parent
+ * inode here. For a directory this is done implicitly
+ * by the xfs_droplink call for the ".." entry.
+ */
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+ }
+
+ /*
+ * Drop the link from dp to ip.
+ */
+ error = xfs_droplink(tp, ip);
+ if (error)
+ goto out_bmap_cancel;
+
+ /*
+ * Determine if this is the last link while
+ * we are in the transaction.
+ */
+ link_zero = (ip->i_d.di_nlink == 0);
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * remove transaction goes to disk before returning to
+ * the user.
+ */
+ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
+ xfs_trans_set_sync(tp);
+
+ error = xfs_bmap_finish(&tp, &free_list, &committed);
+ if (error)
+ goto out_bmap_cancel;
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+ if (error)
+ goto std_return;
+
+ /*
+ * If we are using filestreams, kill the stream association.
+ * If the file is still open it may get a new one but that
+ * will get killed on last close in xfs_close() so we don't
+ * have to worry about that.
+ */
+ if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
+ xfs_filestream_deassociate(ip);
+
+ return 0;
+
+ out_bmap_cancel:
+ xfs_bmap_cancel(&free_list);
+ cancel_flags |= XFS_TRANS_ABORT;
+ out_trans_cancel:
+ xfs_trans_cancel(tp, cancel_flags);
+ std_return:
+ return error;
+}
+
STATIC int
xfs_iflush_cluster(
xfs_inode_t *ip,
corrupt_out:
return XFS_ERROR(EFSCORRUPTED);
}
-
-/*
- * Test whether it is appropriate to check an inode for and free post EOF
- * blocks. The 'force' parameter determines whether we should also consider
- * regular files that are marked preallocated or append-only.
- */
-bool
-xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
-{
- /* prealloc/delalloc exists only on regular files */
- if (!S_ISREG(ip->i_d.di_mode))
- return false;
-
- /*
- * Zero sized files with no cached pages and delalloc blocks will not
- * have speculative prealloc/delalloc blocks to remove.
- */
- if (VFS_I(ip)->i_size == 0 &&
- VN_CACHED(VFS_I(ip)) == 0 &&
- ip->i_delayed_blks == 0)
- return false;
-
- /* If we haven't read in the extent list, then don't do it now. */
- if (!(ip->i_df.if_flags & XFS_IFEXTENTS))
- return false;
-
- /*
- * Do not free real preallocated or append-only files unless the file
- * has delalloc blocks and we are forced to remove them.
- */
- if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
- if (!force || ip->i_delayed_blks == 0)
- return false;
-
- return true;
-}
((pip)->i_d.di_mode & S_ISGID))
-/*
- * xfs_inode.c prototypes.
- */
+int xfs_release(struct xfs_inode *ip);
+int xfs_inactive(struct xfs_inode *ip);
+int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
+ struct xfs_inode **ipp, struct xfs_name *ci_name);
+int xfs_create(struct xfs_inode *dp, struct xfs_name *name,
+ umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
+int xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
+ struct xfs_inode *ip);
+int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
+ struct xfs_name *target_name);
+int xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
+ struct xfs_inode *src_ip, struct xfs_inode *target_dp,
+ struct xfs_name *target_name,
+ struct xfs_inode *target_ip);
+
void xfs_ilock(xfs_inode_t *, uint);
int xfs_ilock_nowait(xfs_inode_t *, uint);
void xfs_iunlock(xfs_inode_t *, uint);
xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
+/* from xfs_file.c */
+int xfs_zero_eof(struct xfs_inode *, xfs_off_t, xfs_fsize_t);
+int xfs_iozero(struct xfs_inode *, loff_t, size_t);
+
+
#define IHOLD(ip) \
do { \
ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
void xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *);
void xfs_dinode_to_disk(struct xfs_dinode *,
struct xfs_icdinode *);
-bool xfs_can_free_eofblocks(struct xfs_inode *, bool);
#if defined(DEBUG)
void xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
#include "xfs_utils.h"
#include "xfs_quota.h"
#include "xfs_filestream.h"
-#include "xfs_vnodeops.h"
#include "xfs_cksum.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_utils.h"
#include "xfs_dfrag.h"
#include "xfs_fsops.h"
-#include "xfs_vnodeops.h"
#include "xfs_discard.h"
#include "xfs_quota.h"
#include "xfs_inode_item.h"
#include "xfs_export.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
+#include "xfs_symlink.h"
#include <linux/capability.h>
#include <linux/dcache.h>
return error;
}
+int
+xfs_set_dmattrs(
+ xfs_inode_t *ip,
+ u_int evmask,
+ u_int16_t state)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_trans_t *tp;
+ int error;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return XFS_ERROR(EPERM);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
+ error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+
+ ip->i_d.di_dmevmask = evmask;
+ ip->i_d.di_dmstate = state;
+
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ error = xfs_trans_commit(tp, 0);
+
+ return error;
+}
+
STATIC int
xfs_fssetdm_by_handle(
struct file *parfilp,
unsigned int cmd,
unsigned long arg);
+extern int
+xfs_set_dmattrs(
+ struct xfs_inode *ip,
+ u_int evmask,
+ u_int16_t state);
+
#endif
#include "xfs_itable.h"
#include "xfs_error.h"
#include "xfs_dfrag.h"
-#include "xfs_vnodeops.h"
#include "xfs_fsops.h"
#include "xfs_alloc.h"
#include "xfs_rtalloc.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
-#include "xfs_vnodeops.h"
#include "xfs_inode_item.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
+#include "xfs_symlink.h"
#include <linux/capability.h>
#include <linux/xattr.h>
extern void xfs_setup_inode(struct xfs_inode *);
+/*
+ * Internal setattr interfaces.
+ */
+#define XFS_ATTR_DMI 0x01 /* invocation from a DMI function */
+#define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if op would block */
+#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
+#define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */
+#define XFS_ATTR_SYNC 0x10 /* synchronous operation required */
+
+extern int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap,
+ int flags);
+extern int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap, int flags);
+
#endif /* __XFS_IOPS_H__ */
#include "xfs_quota.h"
#include "xfs_utils.h"
#include "xfs_trans_space.h"
-#include "xfs_vnodeops.h"
#include "xfs_trace.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
-#include "xfs_vnodeops.h"
#include "xfs_log_priv.h"
#include "xfs_trans_priv.h"
#include "xfs_filestream.h"
+++ /dev/null
-/*
- * Copyright (c) 2000-2006 Silicon Graphics, Inc.
- * Copyright (c) 2012 Red Hat, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "xfs.h"
-#include "xfs_fs.h"
-#include "xfs_format.h"
-#include "xfs_bit.h"
-#include "xfs_log.h"
-#include "xfs_trans.h"
-#include "xfs_sb.h"
-#include "xfs_ag.h"
-#include "xfs_mount.h"
-#include "xfs_da_btree.h"
-#include "xfs_dir2_format.h"
-#include "xfs_dir2.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_dinode.h"
-#include "xfs_inode.h"
-#include "xfs_inode_item.h"
-#include "xfs_itable.h"
-#include "xfs_ialloc.h"
-#include "xfs_alloc.h"
-#include "xfs_bmap.h"
-#include "xfs_bmap_util.h"
-#include "xfs_acl.h"
-#include "xfs_attr.h"
-#include "xfs_error.h"
-#include "xfs_quota.h"
-#include "xfs_utils.h"
-#include "xfs_rtalloc.h"
-#include "xfs_trans_space.h"
-#include "xfs_log_priv.h"
-#include "xfs_filestream.h"
-#include "xfs_vnodeops.h"
-#include "xfs_trace.h"
-#include "xfs_icache.h"
-#include "xfs_symlink.h"
-
-
-/*
- * This is called by xfs_inactive to free any blocks beyond eof
- * when the link count isn't zero and by xfs_dm_punch_hole() when
- * punching a hole to EOF.
- */
-int
-xfs_free_eofblocks(
- xfs_mount_t *mp,
- xfs_inode_t *ip,
- bool need_iolock)
-{
- xfs_trans_t *tp;
- int error;
- xfs_fileoff_t end_fsb;
- xfs_fileoff_t last_fsb;
- xfs_filblks_t map_len;
- int nimaps;
- xfs_bmbt_irec_t imap;
-
- /*
- * Figure out if there are any blocks beyond the end
- * of the file. If not, then there is nothing to do.
- */
- end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
- last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
- if (last_fsb <= end_fsb)
- return 0;
- map_len = last_fsb - end_fsb;
-
- nimaps = 1;
- xfs_ilock(ip, XFS_ILOCK_SHARED);
- error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
-
- if (!error && (nimaps != 0) &&
- (imap.br_startblock != HOLESTARTBLOCK ||
- ip->i_delayed_blks)) {
- /*
- * Attach the dquots to the inode up front.
- */
- error = xfs_qm_dqattach(ip, 0);
- if (error)
- return error;
-
- /*
- * There are blocks after the end of file.
- * Free them up now by truncating the file to
- * its current size.
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
-
- if (need_iolock) {
- if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
- xfs_trans_cancel(tp, 0);
- return EAGAIN;
- }
- }
-
- error = xfs_trans_reserve(tp, 0,
- XFS_ITRUNCATE_LOG_RES(mp),
- 0, XFS_TRANS_PERM_LOG_RES,
- XFS_ITRUNCATE_LOG_COUNT);
- if (error) {
- ASSERT(XFS_FORCED_SHUTDOWN(mp));
- xfs_trans_cancel(tp, 0);
- if (need_iolock)
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
- return error;
- }
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, 0);
-
- /*
- * Do not update the on-disk file size. If we update the
- * on-disk file size and then the system crashes before the
- * contents of the file are flushed to disk then the files
- * may be full of holes (ie NULL files bug).
- */
- error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
- XFS_ISIZE(ip));
- if (error) {
- /*
- * If we get an error at this point we simply don't
- * bother truncating the file.
- */
- xfs_trans_cancel(tp,
- (XFS_TRANS_RELEASE_LOG_RES |
- XFS_TRANS_ABORT));
- } else {
- error = xfs_trans_commit(tp,
- XFS_TRANS_RELEASE_LOG_RES);
- if (!error)
- xfs_inode_clear_eofblocks_tag(ip);
- }
-
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (need_iolock)
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
- }
- return error;
-}
-
-int
-xfs_release(
- xfs_inode_t *ip)
-{
- xfs_mount_t *mp = ip->i_mount;
- int error;
-
- if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
- return 0;
-
- /* If this is a read-only mount, don't do this (would generate I/O) */
- if (mp->m_flags & XFS_MOUNT_RDONLY)
- return 0;
-
- if (!XFS_FORCED_SHUTDOWN(mp)) {
- int truncated;
-
- /*
- * If we are using filestreams, and we have an unlinked
- * file that we are processing the last close on, then nothing
- * will be able to reopen and write to this file. Purge this
- * inode from the filestreams cache so that it doesn't delay
- * teardown of the inode.
- */
- if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
- xfs_filestream_deassociate(ip);
-
- /*
- * If we previously truncated this file and removed old data
- * in the process, we want to initiate "early" writeout on
- * the last close. This is an attempt to combat the notorious
- * NULL files problem which is particularly noticeable from a
- * truncate down, buffered (re-)write (delalloc), followed by
- * a crash. What we are effectively doing here is
- * significantly reducing the time window where we'd otherwise
- * be exposed to that problem.
- */
- truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
- if (truncated) {
- xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
- if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0) {
- error = -filemap_flush(VFS_I(ip)->i_mapping);
- if (error)
- return error;
- }
- }
- }
-
- if (ip->i_d.di_nlink == 0)
- return 0;
-
- if (xfs_can_free_eofblocks(ip, false)) {
-
- /*
- * If we can't get the iolock just skip truncating the blocks
- * past EOF because we could deadlock with the mmap_sem
- * otherwise. We'll get another chance to drop them once the
- * last reference to the inode is dropped, so we'll never leak
- * blocks permanently.
- *
- * Further, check if the inode is being opened, written and
- * closed frequently and we have delayed allocation blocks
- * outstanding (e.g. streaming writes from the NFS server),
- * truncating the blocks past EOF will cause fragmentation to
- * occur.
- *
- * In this case don't do the truncation, either, but we have to
- * be careful how we detect this case. Blocks beyond EOF show
- * up as i_delayed_blks even when the inode is clean, so we
- * need to truncate them away first before checking for a dirty
- * release. Hence on the first dirty close we will still remove
- * the speculative allocation, but after that we will leave it
- * in place.
- */
- if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
- return 0;
-
- error = xfs_free_eofblocks(mp, ip, true);
- if (error && error != EAGAIN)
- return error;
-
- /* delalloc blocks after truncation means it really is dirty */
- if (ip->i_delayed_blks)
- xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
- }
- return 0;
-}
-
-/*
- * xfs_inactive
- *
- * This is called when the vnode reference count for the vnode
- * goes to zero. If the file has been unlinked, then it must
- * now be truncated. Also, we clear all of the read-ahead state
- * kept for the inode here since the file is now closed.
- */
-int
-xfs_inactive(
- xfs_inode_t *ip)
-{
- xfs_bmap_free_t free_list;
- xfs_fsblock_t first_block;
- int committed;
- xfs_trans_t *tp;
- xfs_mount_t *mp;
- int error;
- int truncate = 0;
-
- /*
- * If the inode is already free, then there can be nothing
- * to clean up here.
- */
- if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
- ASSERT(ip->i_df.if_real_bytes == 0);
- ASSERT(ip->i_df.if_broot_bytes == 0);
- return VN_INACTIVE_CACHE;
- }
-
- mp = ip->i_mount;
-
- error = 0;
-
- /* If this is a read-only mount, don't do this (would generate I/O) */
- if (mp->m_flags & XFS_MOUNT_RDONLY)
- goto out;
-
- if (ip->i_d.di_nlink != 0) {
- /*
- * force is true because we are evicting an inode from the
- * cache. Post-eof blocks must be freed, lest we end up with
- * broken free space accounting.
- */
- if (xfs_can_free_eofblocks(ip, true)) {
- error = xfs_free_eofblocks(mp, ip, false);
- if (error)
- return VN_INACTIVE_CACHE;
- }
- goto out;
- }
-
- if (S_ISREG(ip->i_d.di_mode) &&
- (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
- ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
- truncate = 1;
-
- error = xfs_qm_dqattach(ip, 0);
- if (error)
- return VN_INACTIVE_CACHE;
-
- tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
- error = xfs_trans_reserve(tp, 0,
- (truncate || S_ISLNK(ip->i_d.di_mode)) ?
- XFS_ITRUNCATE_LOG_RES(mp) :
- XFS_IFREE_LOG_RES(mp),
- 0,
- XFS_TRANS_PERM_LOG_RES,
- XFS_ITRUNCATE_LOG_COUNT);
- if (error) {
- ASSERT(XFS_FORCED_SHUTDOWN(mp));
- xfs_trans_cancel(tp, 0);
- return VN_INACTIVE_CACHE;
- }
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, 0);
-
- if (S_ISLNK(ip->i_d.di_mode)) {
- error = xfs_inactive_symlink(ip, &tp);
- if (error)
- goto out_cancel;
- } else if (truncate) {
- ip->i_d.di_size = 0;
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
-
- error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
- if (error)
- goto out_cancel;
-
- ASSERT(ip->i_d.di_nextents == 0);
- }
-
- /*
- * If there are attributes associated with the file then blow them away
- * now. The code calls a routine that recursively deconstructs the
- * attribute fork. We need to just commit the current transaction
- * because we can't use it for xfs_attr_inactive().
- */
- if (ip->i_d.di_anextents > 0) {
- ASSERT(ip->i_d.di_forkoff != 0);
-
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- if (error)
- goto out_unlock;
-
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
- error = xfs_attr_inactive(ip);
- if (error)
- goto out;
-
- tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
- error = xfs_trans_reserve(tp, 0,
- XFS_IFREE_LOG_RES(mp),
- 0, XFS_TRANS_PERM_LOG_RES,
- XFS_INACTIVE_LOG_COUNT);
- if (error) {
- xfs_trans_cancel(tp, 0);
- goto out;
- }
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, 0);
- }
-
- if (ip->i_afp)
- xfs_idestroy_fork(ip, XFS_ATTR_FORK);
-
- ASSERT(ip->i_d.di_anextents == 0);
-
- /*
- * Free the inode.
- */
- xfs_bmap_init(&free_list, &first_block);
- error = xfs_ifree(tp, ip, &free_list);
- if (error) {
- /*
- * If we fail to free the inode, shut down. The cancel
- * might do that, we need to make sure. Otherwise the
- * inode might be lost for a long time or forever.
- */
- if (!XFS_FORCED_SHUTDOWN(mp)) {
- xfs_notice(mp, "%s: xfs_ifree returned error %d",
- __func__, error);
- xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
- }
- xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
- } else {
- /*
- * Credit the quota account(s). The inode is gone.
- */
- xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
-
- /*
- * Just ignore errors at this point. There is nothing we can
- * do except to try to keep going. Make sure it's not a silent
- * error.
- */
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error)
- xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
- __func__, error);
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- if (error)
- xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
- __func__, error);
- }
-
- /*
- * Release the dquots held by inode, if any.
- */
- xfs_qm_dqdetach(ip);
-out_unlock:
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-out:
- return VN_INACTIVE_CACHE;
-out_cancel:
- xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
- goto out_unlock;
-}
-
-/*
- * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
- * is allowed, otherwise it has to be an exact match. If a CI match is found,
- * ci_name->name will point to a the actual name (caller must free) or
- * will be set to NULL if an exact match is found.
- */
-int
-xfs_lookup(
- xfs_inode_t *dp,
- struct xfs_name *name,
- xfs_inode_t **ipp,
- struct xfs_name *ci_name)
-{
- xfs_ino_t inum;
- int error;
- uint lock_mode;
-
- trace_xfs_lookup(dp, name);
-
- if (XFS_FORCED_SHUTDOWN(dp->i_mount))
- return XFS_ERROR(EIO);
-
- lock_mode = xfs_ilock_map_shared(dp);
- error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
- xfs_iunlock_map_shared(dp, lock_mode);
-
- if (error)
- goto out;
-
- error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
- if (error)
- goto out_free_name;
-
- return 0;
-
-out_free_name:
- if (ci_name)
- kmem_free(ci_name->name);
-out:
- *ipp = NULL;
- return error;
-}
-
-int
-xfs_create(
- xfs_inode_t *dp,
- struct xfs_name *name,
- umode_t mode,
- xfs_dev_t rdev,
- xfs_inode_t **ipp)
-{
- int is_dir = S_ISDIR(mode);
- struct xfs_mount *mp = dp->i_mount;
- struct xfs_inode *ip = NULL;
- struct xfs_trans *tp = NULL;
- int error;
- xfs_bmap_free_t free_list;
- xfs_fsblock_t first_block;
- bool unlock_dp_on_error = false;
- uint cancel_flags;
- int committed;
- prid_t prid;
- struct xfs_dquot *udqp = NULL;
- struct xfs_dquot *gdqp = NULL;
- struct xfs_dquot *pdqp = NULL;
- uint resblks;
- uint log_res;
- uint log_count;
-
- trace_xfs_create(dp, name);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
- prid = xfs_get_projid(dp);
- else
- prid = XFS_PROJID_DEFAULT;
-
- /*
- * Make sure that we have allocated dquot(s) on disk.
- */
- error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
- XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
- &udqp, &gdqp, &pdqp);
- if (error)
- return error;
-
- if (is_dir) {
- rdev = 0;
- resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
- log_res = XFS_MKDIR_LOG_RES(mp);
- log_count = XFS_MKDIR_LOG_COUNT;
- tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
- } else {
- resblks = XFS_CREATE_SPACE_RES(mp, name->len);
- log_res = XFS_CREATE_LOG_RES(mp);
- log_count = XFS_CREATE_LOG_COUNT;
- tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
- }
-
- cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
-
- /*
- * Initially assume that the file does not exist and
- * reserve the resources for that case. If that is not
- * the case we'll drop the one we have and get a more
- * appropriate transaction later.
- */
- error = xfs_trans_reserve(tp, resblks, log_res, 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- if (error == ENOSPC) {
- /* flush outstanding delalloc blocks and retry */
- xfs_flush_inodes(mp);
- error = xfs_trans_reserve(tp, resblks, log_res, 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- }
- if (error == ENOSPC) {
- /* No space at all so try a "no-allocation" reservation */
- resblks = 0;
- error = xfs_trans_reserve(tp, 0, log_res, 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- }
- if (error) {
- cancel_flags = 0;
- goto out_trans_cancel;
- }
-
- xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
- unlock_dp_on_error = true;
-
- xfs_bmap_init(&free_list, &first_block);
-
- /*
- * Reserve disk quota and the inode.
- */
- error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
- pdqp, resblks, 1, 0);
- if (error)
- goto out_trans_cancel;
-
- error = xfs_dir_canenter(tp, dp, name, resblks);
- if (error)
- goto out_trans_cancel;
-
- /*
- * A newly created regular or special file just has one directory
- * entry pointing to them, but a directory also the "." entry
- * pointing to itself.
- */
- error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
- prid, resblks > 0, &ip, &committed);
- if (error) {
- if (error == ENOSPC)
- goto out_trans_cancel;
- goto out_trans_abort;
- }
-
- /*
- * Now we join the directory inode to the transaction. We do not do it
- * earlier because xfs_dir_ialloc might commit the previous transaction
- * (and release all the locks). An error from here on will result in
- * the transaction cancel unlocking dp so don't do it explicitly in the
- * error path.
- */
- xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
- unlock_dp_on_error = false;
-
- error = xfs_dir_createname(tp, dp, name, ip->i_ino,
- &first_block, &free_list, resblks ?
- resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
- if (error) {
- ASSERT(error != ENOSPC);
- goto out_trans_abort;
- }
- xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
- xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
-
- if (is_dir) {
- error = xfs_dir_init(tp, ip, dp);
- if (error)
- goto out_bmap_cancel;
-
- error = xfs_bumplink(tp, dp);
- if (error)
- goto out_bmap_cancel;
- }
-
- /*
- * If this is a synchronous mount, make sure that the
- * create transaction goes to disk before returning to
- * the user.
- */
- if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
- xfs_trans_set_sync(tp);
-
- /*
- * Attach the dquot(s) to the inodes and modify them incore.
- * These ids of the inode couldn't have changed since the new
- * inode has been locked ever since it was created.
- */
- xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
-
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error)
- goto out_bmap_cancel;
-
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- if (error)
- goto out_release_inode;
-
- xfs_qm_dqrele(udqp);
- xfs_qm_dqrele(gdqp);
- xfs_qm_dqrele(pdqp);
-
- *ipp = ip;
- return 0;
-
- out_bmap_cancel:
- xfs_bmap_cancel(&free_list);
- out_trans_abort:
- cancel_flags |= XFS_TRANS_ABORT;
- out_trans_cancel:
- xfs_trans_cancel(tp, cancel_flags);
- out_release_inode:
- /*
- * Wait until after the current transaction is aborted to
- * release the inode. This prevents recursive transactions
- * and deadlocks from xfs_inactive.
- */
- if (ip)
- IRELE(ip);
-
- xfs_qm_dqrele(udqp);
- xfs_qm_dqrele(gdqp);
- xfs_qm_dqrele(pdqp);
-
- if (unlock_dp_on_error)
- xfs_iunlock(dp, XFS_ILOCK_EXCL);
- return error;
-}
-
-#ifdef DEBUG
-int xfs_locked_n;
-int xfs_small_retries;
-int xfs_middle_retries;
-int xfs_lots_retries;
-int xfs_lock_delays;
-#endif
-
-/*
- * Bump the subclass so xfs_lock_inodes() acquires each lock with
- * a different value
- */
-static inline int
-xfs_lock_inumorder(int lock_mode, int subclass)
-{
- if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
- lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
- if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
- lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
-
- return lock_mode;
-}
-
-/*
- * The following routine will lock n inodes in exclusive mode.
- * We assume the caller calls us with the inodes in i_ino order.
- *
- * We need to detect deadlock where an inode that we lock
- * is in the AIL and we start waiting for another inode that is locked
- * by a thread in a long running transaction (such as truncate). This can
- * result in deadlock since the long running trans might need to wait
- * for the inode we just locked in order to push the tail and free space
- * in the log.
- */
-void
-xfs_lock_inodes(
- xfs_inode_t **ips,
- int inodes,
- uint lock_mode)
-{
- int attempts = 0, i, j, try_lock;
- xfs_log_item_t *lp;
-
- ASSERT(ips && (inodes >= 2)); /* we need at least two */
-
- try_lock = 0;
- i = 0;
-
-again:
- for (; i < inodes; i++) {
- ASSERT(ips[i]);
-
- if (i && (ips[i] == ips[i-1])) /* Already locked */
- continue;
-
- /*
- * If try_lock is not set yet, make sure all locked inodes
- * are not in the AIL.
- * If any are, set try_lock to be used later.
- */
-
- if (!try_lock) {
- for (j = (i - 1); j >= 0 && !try_lock; j--) {
- lp = (xfs_log_item_t *)ips[j]->i_itemp;
- if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
- try_lock++;
- }
- }
- }
-
- /*
- * If any of the previous locks we have locked is in the AIL,
- * we must TRY to get the second and subsequent locks. If
- * we can't get any, we must release all we have
- * and try again.
- */
-
- if (try_lock) {
- /* try_lock must be 0 if i is 0. */
- /*
- * try_lock means we have an inode locked
- * that is in the AIL.
- */
- ASSERT(i != 0);
- if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
- attempts++;
-
- /*
- * Unlock all previous guys and try again.
- * xfs_iunlock will try to push the tail
- * if the inode is in the AIL.
- */
-
- for(j = i - 1; j >= 0; j--) {
-
- /*
- * Check to see if we've already
- * unlocked this one.
- * Not the first one going back,
- * and the inode ptr is the same.
- */
- if ((j != (i - 1)) && ips[j] ==
- ips[j+1])
- continue;
-
- xfs_iunlock(ips[j], lock_mode);
- }
-
- if ((attempts % 5) == 0) {
- delay(1); /* Don't just spin the CPU */
-#ifdef DEBUG
- xfs_lock_delays++;
-#endif
- }
- i = 0;
- try_lock = 0;
- goto again;
- }
- } else {
- xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
- }
- }
-
-#ifdef DEBUG
- if (attempts) {
- if (attempts < 5) xfs_small_retries++;
- else if (attempts < 100) xfs_middle_retries++;
- else xfs_lots_retries++;
- } else {
- xfs_locked_n++;
- }
-#endif
-}
-
-/*
- * xfs_lock_two_inodes() can only be used to lock one type of lock
- * at a time - the iolock or the ilock, but not both at once. If
- * we lock both at once, lockdep will report false positives saying
- * we have violated locking orders.
- */
-void
-xfs_lock_two_inodes(
- xfs_inode_t *ip0,
- xfs_inode_t *ip1,
- uint lock_mode)
-{
- xfs_inode_t *temp;
- int attempts = 0;
- xfs_log_item_t *lp;
-
- if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
- ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
- ASSERT(ip0->i_ino != ip1->i_ino);
-
- if (ip0->i_ino > ip1->i_ino) {
- temp = ip0;
- ip0 = ip1;
- ip1 = temp;
- }
-
- again:
- xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
-
- /*
- * If the first lock we have locked is in the AIL, we must TRY to get
- * the second lock. If we can't get it, we must release the first one
- * and try again.
- */
- lp = (xfs_log_item_t *)ip0->i_itemp;
- if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
- if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
- xfs_iunlock(ip0, lock_mode);
- if ((++attempts % 5) == 0)
- delay(1); /* Don't just spin the CPU */
- goto again;
- }
- } else {
- xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
- }
-}
-
-int
-xfs_remove(
- xfs_inode_t *dp,
- struct xfs_name *name,
- xfs_inode_t *ip)
-{
- xfs_mount_t *mp = dp->i_mount;
- xfs_trans_t *tp = NULL;
- int is_dir = S_ISDIR(ip->i_d.di_mode);
- int error = 0;
- xfs_bmap_free_t free_list;
- xfs_fsblock_t first_block;
- int cancel_flags;
- int committed;
- int link_zero;
- uint resblks;
- uint log_count;
-
- trace_xfs_remove(dp, name);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- error = xfs_qm_dqattach(dp, 0);
- if (error)
- goto std_return;
-
- error = xfs_qm_dqattach(ip, 0);
- if (error)
- goto std_return;
-
- if (is_dir) {
- tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
- log_count = XFS_DEFAULT_LOG_COUNT;
- } else {
- tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
- log_count = XFS_REMOVE_LOG_COUNT;
- }
- cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
-
- /*
- * We try to get the real space reservation first,
- * allowing for directory btree deletion(s) implying
- * possible bmap insert(s). If we can't get the space
- * reservation then we use 0 instead, and avoid the bmap
- * btree insert(s) in the directory code by, if the bmap
- * insert tries to happen, instead trimming the LAST
- * block from the directory.
- */
- resblks = XFS_REMOVE_SPACE_RES(mp);
- error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- if (error == ENOSPC) {
- resblks = 0;
- error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, log_count);
- }
- if (error) {
- ASSERT(error != ENOSPC);
- cancel_flags = 0;
- goto out_trans_cancel;
- }
-
- xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
-
- xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-
- /*
- * If we're removing a directory perform some additional validation.
- */
- if (is_dir) {
- ASSERT(ip->i_d.di_nlink >= 2);
- if (ip->i_d.di_nlink != 2) {
- error = XFS_ERROR(ENOTEMPTY);
- goto out_trans_cancel;
- }
- if (!xfs_dir_isempty(ip)) {
- error = XFS_ERROR(ENOTEMPTY);
- goto out_trans_cancel;
- }
- }
-
- xfs_bmap_init(&free_list, &first_block);
- error = xfs_dir_removename(tp, dp, name, ip->i_ino,
- &first_block, &free_list, resblks);
- if (error) {
- ASSERT(error != ENOENT);
- goto out_bmap_cancel;
- }
- xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
-
- if (is_dir) {
- /*
- * Drop the link from ip's "..".
- */
- error = xfs_droplink(tp, dp);
- if (error)
- goto out_bmap_cancel;
-
- /*
- * Drop the "." link from ip to self.
- */
- error = xfs_droplink(tp, ip);
- if (error)
- goto out_bmap_cancel;
- } else {
- /*
- * When removing a non-directory we need to log the parent
- * inode here. For a directory this is done implicitly
- * by the xfs_droplink call for the ".." entry.
- */
- xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
- }
-
- /*
- * Drop the link from dp to ip.
- */
- error = xfs_droplink(tp, ip);
- if (error)
- goto out_bmap_cancel;
-
- /*
- * Determine if this is the last link while
- * we are in the transaction.
- */
- link_zero = (ip->i_d.di_nlink == 0);
-
- /*
- * If this is a synchronous mount, make sure that the
- * remove transaction goes to disk before returning to
- * the user.
- */
- if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
- xfs_trans_set_sync(tp);
-
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error)
- goto out_bmap_cancel;
-
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- if (error)
- goto std_return;
-
- /*
- * If we are using filestreams, kill the stream association.
- * If the file is still open it may get a new one but that
- * will get killed on last close in xfs_close() so we don't
- * have to worry about that.
- */
- if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
- xfs_filestream_deassociate(ip);
-
- return 0;
-
- out_bmap_cancel:
- xfs_bmap_cancel(&free_list);
- cancel_flags |= XFS_TRANS_ABORT;
- out_trans_cancel:
- xfs_trans_cancel(tp, cancel_flags);
- std_return:
- return error;
-}
-
-int
-xfs_link(
- xfs_inode_t *tdp,
- xfs_inode_t *sip,
- struct xfs_name *target_name)
-{
- xfs_mount_t *mp = tdp->i_mount;
- xfs_trans_t *tp;
- int error;
- xfs_bmap_free_t free_list;
- xfs_fsblock_t first_block;
- int cancel_flags;
- int committed;
- int resblks;
-
- trace_xfs_link(tdp, target_name);
-
- ASSERT(!S_ISDIR(sip->i_d.di_mode));
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- error = xfs_qm_dqattach(sip, 0);
- if (error)
- goto std_return;
-
- error = xfs_qm_dqattach(tdp, 0);
- if (error)
- goto std_return;
-
- tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
- cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
- resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
- error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
- if (error == ENOSPC) {
- resblks = 0;
- error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
- }
- if (error) {
- cancel_flags = 0;
- goto error_return;
- }
-
- xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
-
- xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
-
- /*
- * If we are using project inheritance, we only allow hard link
- * creation in our tree when the project IDs are the same; else
- * the tree quota mechanism could be circumvented.
- */
- if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
- (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
- error = XFS_ERROR(EXDEV);
- goto error_return;
- }
-
- error = xfs_dir_canenter(tp, tdp, target_name, resblks);
- if (error)
- goto error_return;
-
- xfs_bmap_init(&free_list, &first_block);
-
- error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
- &first_block, &free_list, resblks);
- if (error)
- goto abort_return;
- xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
- xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
-
- error = xfs_bumplink(tp, sip);
- if (error)
- goto abort_return;
-
- /*
- * If this is a synchronous mount, make sure that the
- * link transaction goes to disk before returning to
- * the user.
- */
- if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
- xfs_trans_set_sync(tp);
- }
-
- error = xfs_bmap_finish (&tp, &free_list, &committed);
- if (error) {
- xfs_bmap_cancel(&free_list);
- goto abort_return;
- }
-
- return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
-
- abort_return:
- cancel_flags |= XFS_TRANS_ABORT;
- error_return:
- xfs_trans_cancel(tp, cancel_flags);
- std_return:
- return error;
-}
-
-int
-xfs_set_dmattrs(
- xfs_inode_t *ip,
- u_int evmask,
- u_int16_t state)
-{
- xfs_mount_t *mp = ip->i_mount;
- xfs_trans_t *tp;
- int error;
-
- if (!capable(CAP_SYS_ADMIN))
- return XFS_ERROR(EPERM);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
- error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
- if (error) {
- xfs_trans_cancel(tp, 0);
- return error;
- }
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-
- ip->i_d.di_dmevmask = evmask;
- ip->i_d.di_dmstate = state;
-
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- error = xfs_trans_commit(tp, 0);
-
- return error;
-}
-
-/*
- * xfs_alloc_file_space()
- * This routine allocates disk space for the given file.
- *
- * If alloc_type == 0, this request is for an ALLOCSP type
- * request which will change the file size. In this case, no
- * DMAPI event will be generated by the call. A TRUNCATE event
- * will be generated later by xfs_setattr.
- *
- * If alloc_type != 0, this request is for a RESVSP type
- * request, and a DMAPI DM_EVENT_WRITE will be generated if the
- * lower block boundary byte address is less than the file's
- * length.
- *
- * RETURNS:
- * 0 on success
- * errno on error
- *
- */
-STATIC int
-xfs_alloc_file_space(
- xfs_inode_t *ip,
- xfs_off_t offset,
- xfs_off_t len,
- int alloc_type,
- int attr_flags)
-{
- xfs_mount_t *mp = ip->i_mount;
- xfs_off_t count;
- xfs_filblks_t allocated_fsb;
- xfs_filblks_t allocatesize_fsb;
- xfs_extlen_t extsz, temp;
- xfs_fileoff_t startoffset_fsb;
- xfs_fsblock_t firstfsb;
- int nimaps;
- int quota_flag;
- int rt;
- xfs_trans_t *tp;
- xfs_bmbt_irec_t imaps[1], *imapp;
- xfs_bmap_free_t free_list;
- uint qblocks, resblks, resrtextents;
- int committed;
- int error;
-
- trace_xfs_alloc_file_space(ip);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- error = xfs_qm_dqattach(ip, 0);
- if (error)
- return error;
-
- if (len <= 0)
- return XFS_ERROR(EINVAL);
-
- rt = XFS_IS_REALTIME_INODE(ip);
- extsz = xfs_get_extsz_hint(ip);
-
- count = len;
- imapp = &imaps[0];
- nimaps = 1;
- startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
- allocatesize_fsb = XFS_B_TO_FSB(mp, count);
-
- /*
- * Allocate file space until done or until there is an error
- */
- while (allocatesize_fsb && !error) {
- xfs_fileoff_t s, e;
-
- /*
- * Determine space reservations for data/realtime.
- */
- if (unlikely(extsz)) {
- s = startoffset_fsb;
- do_div(s, extsz);
- s *= extsz;
- e = startoffset_fsb + allocatesize_fsb;
- if ((temp = do_mod(startoffset_fsb, extsz)))
- e += temp;
- if ((temp = do_mod(e, extsz)))
- e += extsz - temp;
- } else {
- s = 0;
- e = allocatesize_fsb;
- }
-
- /*
- * The transaction reservation is limited to a 32-bit block
- * count, hence we need to limit the number of blocks we are
- * trying to reserve to avoid an overflow. We can't allocate
- * more than @nimaps extents, and an extent is limited on disk
- * to MAXEXTLEN (21 bits), so use that to enforce the limit.
- */
- resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
- if (unlikely(rt)) {
- resrtextents = qblocks = resblks;
- resrtextents /= mp->m_sb.sb_rextsize;
- resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
- quota_flag = XFS_QMOPT_RES_RTBLKS;
- } else {
- resrtextents = 0;
- resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
- quota_flag = XFS_QMOPT_RES_REGBLKS;
- }
-
- /*
- * Allocate and setup the transaction.
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
- error = xfs_trans_reserve(tp, resblks,
- XFS_WRITE_LOG_RES(mp), resrtextents,
- XFS_TRANS_PERM_LOG_RES,
- XFS_WRITE_LOG_COUNT);
- /*
- * Check for running out of space
- */
- if (error) {
- /*
- * Free the transaction structure.
- */
- ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
- xfs_trans_cancel(tp, 0);
- break;
- }
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
- 0, quota_flag);
- if (error)
- goto error1;
-
- xfs_trans_ijoin(tp, ip, 0);
-
- xfs_bmap_init(&free_list, &firstfsb);
- error = xfs_bmapi_write(tp, ip, startoffset_fsb,
- allocatesize_fsb, alloc_type, &firstfsb,
- 0, imapp, &nimaps, &free_list);
- if (error) {
- goto error0;
- }
-
- /*
- * Complete the transaction
- */
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error) {
- goto error0;
- }
-
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error) {
- break;
- }
-
- allocated_fsb = imapp->br_blockcount;
-
- if (nimaps == 0) {
- error = XFS_ERROR(ENOSPC);
- break;
- }
-
- startoffset_fsb += allocated_fsb;
- allocatesize_fsb -= allocated_fsb;
- }
-
- return error;
-
-error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
- xfs_bmap_cancel(&free_list);
- xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
-
-error1: /* Just cancel transaction */
- xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- return error;
-}
-
-/*
- * Zero file bytes between startoff and endoff inclusive.
- * The iolock is held exclusive and no blocks are buffered.
- *
- * This function is used by xfs_free_file_space() to zero
- * partial blocks when the range to free is not block aligned.
- * When unreserving space with boundaries that are not block
- * aligned we round up the start and round down the end
- * boundaries and then use this function to zero the parts of
- * the blocks that got dropped during the rounding.
- */
-STATIC int
-xfs_zero_remaining_bytes(
- xfs_inode_t *ip,
- xfs_off_t startoff,
- xfs_off_t endoff)
-{
- xfs_bmbt_irec_t imap;
- xfs_fileoff_t offset_fsb;
- xfs_off_t lastoffset;
- xfs_off_t offset;
- xfs_buf_t *bp;
- xfs_mount_t *mp = ip->i_mount;
- int nimap;
- int error = 0;
-
- /*
- * Avoid doing I/O beyond eof - it's not necessary
- * since nothing can read beyond eof. The space will
- * be zeroed when the file is extended anyway.
- */
- if (startoff >= XFS_ISIZE(ip))
- return 0;
-
- if (endoff > XFS_ISIZE(ip))
- endoff = XFS_ISIZE(ip);
-
- bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
- mp->m_rtdev_targp : mp->m_ddev_targp,
- BTOBB(mp->m_sb.sb_blocksize), 0);
- if (!bp)
- return XFS_ERROR(ENOMEM);
-
- xfs_buf_unlock(bp);
-
- for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
- nimap = 1;
- error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
- if (error || nimap < 1)
- break;
- ASSERT(imap.br_blockcount >= 1);
- ASSERT(imap.br_startoff == offset_fsb);
- lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
- if (lastoffset > endoff)
- lastoffset = endoff;
- if (imap.br_startblock == HOLESTARTBLOCK)
- continue;
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
- if (imap.br_state == XFS_EXT_UNWRITTEN)
- continue;
- XFS_BUF_UNDONE(bp);
- XFS_BUF_UNWRITE(bp);
- XFS_BUF_READ(bp);
- XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
- xfsbdstrat(mp, bp);
- error = xfs_buf_iowait(bp);
- if (error) {
- xfs_buf_ioerror_alert(bp,
- "xfs_zero_remaining_bytes(read)");
- break;
- }
- memset(bp->b_addr +
- (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
- 0, lastoffset - offset + 1);
- XFS_BUF_UNDONE(bp);
- XFS_BUF_UNREAD(bp);
- XFS_BUF_WRITE(bp);
- xfsbdstrat(mp, bp);
- error = xfs_buf_iowait(bp);
- if (error) {
- xfs_buf_ioerror_alert(bp,
- "xfs_zero_remaining_bytes(write)");
- break;
- }
- }
- xfs_buf_free(bp);
- return error;
-}
-
-/*
- * xfs_free_file_space()
- * This routine frees disk space for the given file.
- *
- * This routine is only called by xfs_change_file_space
- * for an UNRESVSP type call.
- *
- * RETURNS:
- * 0 on success
- * errno on error
- *
- */
-STATIC int
-xfs_free_file_space(
- xfs_inode_t *ip,
- xfs_off_t offset,
- xfs_off_t len,
- int attr_flags)
-{
- int committed;
- int done;
- xfs_fileoff_t endoffset_fsb;
- int error;
- xfs_fsblock_t firstfsb;
- xfs_bmap_free_t free_list;
- xfs_bmbt_irec_t imap;
- xfs_off_t ioffset;
- xfs_extlen_t mod=0;
- xfs_mount_t *mp;
- int nimap;
- uint resblks;
- xfs_off_t rounding;
- int rt;
- xfs_fileoff_t startoffset_fsb;
- xfs_trans_t *tp;
- int need_iolock = 1;
-
- mp = ip->i_mount;
-
- trace_xfs_free_file_space(ip);
-
- error = xfs_qm_dqattach(ip, 0);
- if (error)
- return error;
-
- error = 0;
- if (len <= 0) /* if nothing being freed */
- return error;
- rt = XFS_IS_REALTIME_INODE(ip);
- startoffset_fsb = XFS_B_TO_FSB(mp, offset);
- endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
-
- if (attr_flags & XFS_ATTR_NOLOCK)
- need_iolock = 0;
- if (need_iolock) {
- xfs_ilock(ip, XFS_IOLOCK_EXCL);
- /* wait for the completion of any pending DIOs */
- inode_dio_wait(VFS_I(ip));
- }
-
- rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
- ioffset = offset & ~(rounding - 1);
- error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
- ioffset, -1);
- if (error)
- goto out_unlock_iolock;
- truncate_pagecache_range(VFS_I(ip), ioffset, -1);
-
- /*
- * Need to zero the stuff we're not freeing, on disk.
- * If it's a realtime file & can't use unwritten extents then we
- * actually need to zero the extent edges. Otherwise xfs_bunmapi
- * will take care of it for us.
- */
- if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
- nimap = 1;
- error = xfs_bmapi_read(ip, startoffset_fsb, 1,
- &imap, &nimap, 0);
- if (error)
- goto out_unlock_iolock;
- ASSERT(nimap == 0 || nimap == 1);
- if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
- xfs_daddr_t block;
-
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
- block = imap.br_startblock;
- mod = do_div(block, mp->m_sb.sb_rextsize);
- if (mod)
- startoffset_fsb += mp->m_sb.sb_rextsize - mod;
- }
- nimap = 1;
- error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
- &imap, &nimap, 0);
- if (error)
- goto out_unlock_iolock;
- ASSERT(nimap == 0 || nimap == 1);
- if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
- mod++;
- if (mod && (mod != mp->m_sb.sb_rextsize))
- endoffset_fsb -= mod;
- }
- }
- if ((done = (endoffset_fsb <= startoffset_fsb)))
- /*
- * One contiguous piece to clear
- */
- error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
- else {
- /*
- * Some full blocks, possibly two pieces to clear
- */
- if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
- error = xfs_zero_remaining_bytes(ip, offset,
- XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
- if (!error &&
- XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
- error = xfs_zero_remaining_bytes(ip,
- XFS_FSB_TO_B(mp, endoffset_fsb),
- offset + len - 1);
- }
-
- /*
- * free file space until done or until there is an error
- */
- resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
- while (!error && !done) {
-
- /*
- * allocate and setup the transaction. Allow this
- * transaction to dip into the reserve blocks to ensure
- * the freeing of the space succeeds at ENOSPC.
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
- tp->t_flags |= XFS_TRANS_RESERVE;
- error = xfs_trans_reserve(tp,
- resblks,
- XFS_WRITE_LOG_RES(mp),
- 0,
- XFS_TRANS_PERM_LOG_RES,
- XFS_WRITE_LOG_COUNT);
-
- /*
- * check for running out of space
- */
- if (error) {
- /*
- * Free the transaction structure.
- */
- ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
- xfs_trans_cancel(tp, 0);
- break;
- }
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_trans_reserve_quota(tp, mp,
- ip->i_udquot, ip->i_gdquot, ip->i_pdquot,
- resblks, 0, XFS_QMOPT_RES_REGBLKS);
- if (error)
- goto error1;
-
- xfs_trans_ijoin(tp, ip, 0);
-
- /*
- * issue the bunmapi() call to free the blocks
- */
- xfs_bmap_init(&free_list, &firstfsb);
- error = xfs_bunmapi(tp, ip, startoffset_fsb,
- endoffset_fsb - startoffset_fsb,
- 0, 2, &firstfsb, &free_list, &done);
- if (error) {
- goto error0;
- }
-
- /*
- * complete the transaction
- */
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error) {
- goto error0;
- }
-
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- }
-
- out_unlock_iolock:
- if (need_iolock)
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
- return error;
-
- error0:
- xfs_bmap_cancel(&free_list);
- error1:
- xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
- xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
- XFS_ILOCK_EXCL);
- return error;
-}
-
-
-STATIC int
-xfs_zero_file_space(
- struct xfs_inode *ip,
- xfs_off_t offset,
- xfs_off_t len,
- int attr_flags)
-{
- struct xfs_mount *mp = ip->i_mount;
- uint granularity;
- xfs_off_t start_boundary;
- xfs_off_t end_boundary;
- int error;
-
- granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
-
- /*
- * Round the range of extents we are going to convert inwards. If the
- * offset is aligned, then it doesn't get changed so we zero from the
- * start of the block offset points to.
- */
- start_boundary = round_up(offset, granularity);
- end_boundary = round_down(offset + len, granularity);
-
- ASSERT(start_boundary >= offset);
- ASSERT(end_boundary <= offset + len);
-
- if (!(attr_flags & XFS_ATTR_NOLOCK))
- xfs_ilock(ip, XFS_IOLOCK_EXCL);
-
- if (start_boundary < end_boundary - 1) {
- /* punch out the page cache over the conversion range */
- truncate_pagecache_range(VFS_I(ip), start_boundary,
- end_boundary - 1);
- /* convert the blocks */
- error = xfs_alloc_file_space(ip, start_boundary,
- end_boundary - start_boundary - 1,
- XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT,
- attr_flags);
- if (error)
- goto out_unlock;
-
- /* We've handled the interior of the range, now for the edges */
- if (start_boundary != offset)
- error = xfs_iozero(ip, offset, start_boundary - offset);
- if (error)
- goto out_unlock;
-
- if (end_boundary != offset + len)
- error = xfs_iozero(ip, end_boundary,
- offset + len - end_boundary);
-
- } else {
- /*
- * It's either a sub-granularity range or the range spanned lies
- * partially across two adjacent blocks.
- */
- error = xfs_iozero(ip, offset, len);
- }
-
-out_unlock:
- if (!(attr_flags & XFS_ATTR_NOLOCK))
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
- return error;
-
-}
-
-/*
- * xfs_change_file_space()
- * This routine allocates or frees disk space for the given file.
- * The user specified parameters are checked for alignment and size
- * limitations.
- *
- * RETURNS:
- * 0 on success
- * errno on error
- *
- */
-int
-xfs_change_file_space(
- xfs_inode_t *ip,
- int cmd,
- xfs_flock64_t *bf,
- xfs_off_t offset,
- int attr_flags)
-{
- xfs_mount_t *mp = ip->i_mount;
- int clrprealloc;
- int error;
- xfs_fsize_t fsize;
- int setprealloc;
- xfs_off_t startoffset;
- xfs_trans_t *tp;
- struct iattr iattr;
-
- if (!S_ISREG(ip->i_d.di_mode))
- return XFS_ERROR(EINVAL);
-
- switch (bf->l_whence) {
- case 0: /*SEEK_SET*/
- break;
- case 1: /*SEEK_CUR*/
- bf->l_start += offset;
- break;
- case 2: /*SEEK_END*/
- bf->l_start += XFS_ISIZE(ip);
- break;
- default:
- return XFS_ERROR(EINVAL);
- }
-
- /*
- * length of <= 0 for resv/unresv/zero is invalid. length for
- * alloc/free is ignored completely and we have no idea what userspace
- * might have set it to, so set it to zero to allow range
- * checks to pass.
- */
- switch (cmd) {
- case XFS_IOC_ZERO_RANGE:
- case XFS_IOC_RESVSP:
- case XFS_IOC_RESVSP64:
- case XFS_IOC_UNRESVSP:
- case XFS_IOC_UNRESVSP64:
- if (bf->l_len <= 0)
- return XFS_ERROR(EINVAL);
- break;
- default:
- bf->l_len = 0;
- break;
- }
-
- if (bf->l_start < 0 ||
- bf->l_start > mp->m_super->s_maxbytes ||
- bf->l_start + bf->l_len < 0 ||
- bf->l_start + bf->l_len >= mp->m_super->s_maxbytes)
- return XFS_ERROR(EINVAL);
-
- bf->l_whence = 0;
-
- startoffset = bf->l_start;
- fsize = XFS_ISIZE(ip);
-
- setprealloc = clrprealloc = 0;
- switch (cmd) {
- case XFS_IOC_ZERO_RANGE:
- error = xfs_zero_file_space(ip, startoffset, bf->l_len,
- attr_flags);
- if (error)
- return error;
- setprealloc = 1;
- break;
-
- case XFS_IOC_RESVSP:
- case XFS_IOC_RESVSP64:
- error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
- XFS_BMAPI_PREALLOC, attr_flags);
- if (error)
- return error;
- setprealloc = 1;
- break;
-
- case XFS_IOC_UNRESVSP:
- case XFS_IOC_UNRESVSP64:
- if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
- attr_flags)))
- return error;
- break;
-
- case XFS_IOC_ALLOCSP:
- case XFS_IOC_ALLOCSP64:
- case XFS_IOC_FREESP:
- case XFS_IOC_FREESP64:
- /*
- * These operations actually do IO when extending the file, but
- * the allocation is done seperately to the zeroing that is
- * done. This set of operations need to be serialised against
- * other IO operations, such as truncate and buffered IO. We
- * need to take the IOLOCK here to serialise the allocation and
- * zeroing IO to prevent other IOLOCK holders (e.g. getbmap,
- * truncate, direct IO) from racing against the transient
- * allocated but not written state we can have here.
- */
- xfs_ilock(ip, XFS_IOLOCK_EXCL);
- if (startoffset > fsize) {
- error = xfs_alloc_file_space(ip, fsize,
- startoffset - fsize, 0,
- attr_flags | XFS_ATTR_NOLOCK);
- if (error) {
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
- break;
- }
- }
-
- iattr.ia_valid = ATTR_SIZE;
- iattr.ia_size = startoffset;
-
- error = xfs_setattr_size(ip, &iattr,
- attr_flags | XFS_ATTR_NOLOCK);
- xfs_iunlock(ip, XFS_IOLOCK_EXCL);
-
- if (error)
- return error;
-
- clrprealloc = 1;
- break;
-
- default:
- ASSERT(0);
- return XFS_ERROR(EINVAL);
- }
-
- /*
- * update the inode timestamp, mode, and prealloc flag bits
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
-
- if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
- 0, 0, 0))) {
- /* ASSERT(0); */
- xfs_trans_cancel(tp, 0);
- return error;
- }
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-
- if ((attr_flags & XFS_ATTR_DMI) == 0) {
- ip->i_d.di_mode &= ~S_ISUID;
-
- /*
- * Note that we don't have to worry about mandatory
- * file locking being disabled here because we only
- * clear the S_ISGID bit if the Group execute bit is
- * on, but if it was on then mandatory locking wouldn't
- * have been enabled.
- */
- if (ip->i_d.di_mode & S_IXGRP)
- ip->i_d.di_mode &= ~S_ISGID;
-
- xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
- }
- if (setprealloc)
- ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
- else if (clrprealloc)
- ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
-
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- if (attr_flags & XFS_ATTR_SYNC)
- xfs_trans_set_sync(tp);
- return xfs_trans_commit(tp, 0);
-}
+++ /dev/null
-#ifndef _XFS_VNODEOPS_H
-#define _XFS_VNODEOPS_H 1
-
-struct attrlist_cursor_kern;
-struct file;
-struct iattr;
-struct inode;
-struct iovec;
-struct kiocb;
-struct pipe_inode_info;
-struct uio;
-struct xfs_inode;
-
-
-int xfs_setattr_nonsize(struct xfs_inode *ip, struct iattr *vap, int flags);
-int xfs_setattr_size(struct xfs_inode *ip, struct iattr *vap, int flags);
-#define XFS_ATTR_DMI 0x01 /* invocation from a DMI function */
-#define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if operation would block */
-#define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */
-#define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */
-#define XFS_ATTR_SYNC 0x10 /* synchronous operation required */
-
-int xfs_readlink(struct xfs_inode *ip, char *link);
-int xfs_release(struct xfs_inode *ip);
-int xfs_inactive(struct xfs_inode *ip);
-int xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
- struct xfs_inode **ipp, struct xfs_name *ci_name);
-int xfs_create(struct xfs_inode *dp, struct xfs_name *name, umode_t mode,
- xfs_dev_t rdev, struct xfs_inode **ipp);
-int xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
- struct xfs_inode *ip);
-int xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
- struct xfs_name *target_name);
-int xfs_readdir(struct xfs_inode *dp, struct dir_context *ctx, size_t bufsize);
-int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name,
- const char *target_path, umode_t mode, struct xfs_inode **ipp);
-int xfs_set_dmattrs(struct xfs_inode *ip, u_int evmask, u_int16_t state);
-int xfs_change_file_space(struct xfs_inode *ip, int cmd,
- xfs_flock64_t *bf, xfs_off_t offset, int attr_flags);
-int xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
- struct xfs_inode *src_ip, struct xfs_inode *target_dp,
- struct xfs_name *target_name, struct xfs_inode *target_ip);
-int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
- unsigned char *value, int *valuelenp, int flags);
-int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
- unsigned char *value, int valuelen, int flags);
-int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
-int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
- int flags, struct attrlist_cursor_kern *cursor);
-
-int xfs_iozero(struct xfs_inode *, loff_t, size_t);
-int xfs_zero_eof(struct xfs_inode *, xfs_off_t, xfs_fsize_t);
-int xfs_free_eofblocks(struct xfs_mount *, struct xfs_inode *, bool);
-
-#endif /* _XFS_VNODEOPS_H */
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_acl.h"
-#include "xfs_vnodeops.h"
#include <linux/posix_acl_xattr.h>
#include <linux/xattr.h>
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff