6.12-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Gruenbacher agruenba@redhat.com
[ Upstream commit 2c63986dd35fa9eb0d7d1530b5eb2244b7296e22 ]
When creating and destroying inodes, we are relying on the inode hash table to make sure that for a given inode number, only a single inode will exist. We then link that inode to its inode and iopen glock and let those glocks point back at the inode. However, when iget_failed() is called, the inode is removed from the inode hash table before gfs_evict_inode() is called, and uniqueness is no longer guaranteed.
Commit f1046a472b70 ("gfs2: gl_object races fix") was trying to work around that problem by detaching the inode glock from the inode before calling iget_failed(), but that broke the inode deallocation code in gfs_evict_inode().
To fix that, deallocate partially created inodes in gfs2_create_inode() instead of relying on gfs_evict_inode() for doing that.
This means that gfs2_evict_inode() and its helper functions will no longer see partially created inodes, and so some simplifications are possible there.
Fixes: 9ffa18884cce ("gfs2: gl_object races fix") Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/gfs2/inode.c | 27 +++++++++++++++++++-------- fs/gfs2/super.c | 6 +----- 2 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index e59fde1bae7b7..0b546024f5ef7 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -697,10 +697,11 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, struct gfs2_inode *dip = GFS2_I(dir), *ip; struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); struct gfs2_glock *io_gl; - int error; + int error, dealloc_error; u32 aflags = 0; unsigned blocks = 1; struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, }; + bool xattr_initialized = false;
if (!name->len || name->len > GFS2_FNAMESIZE) return -ENAMETOOLONG; @@ -813,11 +814,11 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); if (error) - goto fail_free_inode; + goto fail_dealloc_inode;
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); if (error) - goto fail_free_inode; + goto fail_dealloc_inode; gfs2_cancel_delete_work(io_gl); io_gl->gl_no_formal_ino = ip->i_no_formal_ino;
@@ -841,8 +842,10 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, if (error) goto fail_gunlock3;
- if (blocks > 1) + if (blocks > 1) { gfs2_init_xattr(ip); + xattr_initialized = true; + } init_dinode(dip, ip, symname); gfs2_trans_end(sdp);
@@ -897,6 +900,18 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, gfs2_glock_dq_uninit(&ip->i_iopen_gh); fail_gunlock2: gfs2_glock_put(io_gl); +fail_dealloc_inode: + set_bit(GIF_ALLOC_FAILED, &ip->i_flags); + dealloc_error = 0; + if (ip->i_eattr) + dealloc_error = gfs2_ea_dealloc(ip, xattr_initialized); + clear_nlink(inode); + mark_inode_dirty(inode); + if (!dealloc_error) + dealloc_error = gfs2_dinode_dealloc(ip); + if (dealloc_error) + fs_warn(sdp, "%s: %d\n", __func__, dealloc_error); + ip->i_no_addr = 0; fail_free_inode: if (ip->i_gl) { gfs2_glock_put(ip->i_gl); @@ -911,10 +926,6 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, gfs2_dir_no_add(&da); gfs2_glock_dq_uninit(&d_gh); if (!IS_ERR_OR_NULL(inode)) { - set_bit(GIF_ALLOC_FAILED, &ip->i_flags); - clear_nlink(inode); - if (ip->i_no_addr) - mark_inode_dirty(inode); if (inode->i_state & I_NEW) iget_failed(inode); else diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 694d554dba546..3b1303f97a3bc 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1255,9 +1255,6 @@ static enum evict_behavior evict_should_delete(struct inode *inode, struct gfs2_sbd *sdp = sb->s_fs_info; int ret;
- if (unlikely(test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) - goto should_delete; - if (gfs2_holder_initialized(&ip->i_iopen_gh) && test_bit(GLF_DEFER_DELETE, &ip->i_iopen_gh.gh_gl->gl_flags)) return EVICT_SHOULD_DEFER_DELETE; @@ -1291,7 +1288,6 @@ static enum evict_behavior evict_should_delete(struct inode *inode, if (inode->i_nlink) return EVICT_SHOULD_SKIP_DELETE;
-should_delete: if (gfs2_holder_initialized(&ip->i_iopen_gh) && test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { if (!gfs2_upgrade_iopen_glock(inode)) { @@ -1319,7 +1315,7 @@ static int evict_unlinked_inode(struct inode *inode) }
if (ip->i_eattr) { - ret = gfs2_ea_dealloc(ip, !test_bit(GIF_ALLOC_FAILED, &ip->i_flags)); + ret = gfs2_ea_dealloc(ip, true); if (ret) goto out; }