From: Dave Chinner Date: Tue, 12 Apr 2011 09:18:08 +0000 (+1000) Subject: nfs: don't call __mark_inode_dirty while holding i_lock X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0d88f6e804c824454b5ed0d3034ed3dcf7467a87;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git nfs: don't call __mark_inode_dirty while holding i_lock nfs_scan_commit() is called with the inode->i_lock held, but it then calls __mark_inode_dirty() while still holding the lock. This causes a deadlock. Push the inode->i_lock into nfs_scan_commit() so it can protect only the parts of the code it needs to and can be dropped before the call to __mark_inode_dirty() to avoid the deadlock. Signed-off-by: Dave Chinner Tested-by: Will Simoneau Signed-off-by: Linus Torvalds --- diff --git a/fs/nfs/write.c b/fs/nfs/write.c index af0c6279a4a7..e4cbc11a74ab 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -542,11 +542,15 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, u if (!nfs_need_commit(nfsi)) return 0; + spin_lock(&inode->i_lock); ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); if (ret > 0) nfsi->ncommit -= ret; + spin_unlock(&inode->i_lock); + if (nfs_need_commit(NFS_I(inode))) __mark_inode_dirty(inode, I_DIRTY_DATASYNC); + return ret; } #else @@ -1483,9 +1487,7 @@ int nfs_commit_inode(struct inode *inode, int how) res = nfs_commit_set_lock(NFS_I(inode), may_wait); if (res <= 0) goto out_mark_dirty; - spin_lock(&inode->i_lock); res = nfs_scan_commit(inode, &head, 0, 0); - spin_unlock(&inode->i_lock); if (res) { int error;