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authorBob Peterson <rpeterso@redhat.com>2020-09-11 18:30:26 +0300
committerAndreas Gruenbacher <agruenba@redhat.com>2020-10-15 00:54:42 +0300
commit53dbc27eb18999619766ff994d2b33c4655c5588 (patch)
tree69f4cb9f1ae56ef0a6073d55cb7b09a2b18c78c5 /fs/gfs2/super.c
parent6e7e9a505571db3edc926f4bc972c7ed3da29a9d (diff)
downloadlinux-53dbc27eb18999619766ff994d2b33c4655c5588.tar.xz
gfs2: further simplify gfs2_evict_inode with new func evict_should_delete
This patch further simplifies function gfs2_evict_inode() by adding a new function evict_should_delete. The function may also lock the inode glock. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c122
1 files changed, 77 insertions, 45 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index b5279a1d9cb0..e44030644fcd 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -44,6 +44,12 @@
#include "xattr.h"
#include "lops.h"
+enum dinode_demise {
+ SHOULD_DELETE_DINODE,
+ SHOULD_NOT_DELETE_DINODE,
+ SHOULD_DEFER_EVICTION,
+};
+
/**
* gfs2_jindex_free - Clear all the journal index information
* @sdp: The GFS2 superblock
@@ -1311,6 +1317,73 @@ static bool gfs2_upgrade_iopen_glock(struct inode *inode)
}
/**
+ * evict_should_delete - determine whether the inode is eligible for deletion
+ * @inode: The inode to evict
+ *
+ * This function determines whether the evicted inode is eligible to be deleted
+ * and locks the inode glock.
+ *
+ * Returns: the fate of the dinode
+ */
+static enum dinode_demise evict_should_delete(struct inode *inode,
+ struct gfs2_holder *gh)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct super_block *sb = inode->i_sb;
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ int ret;
+
+ if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
+ BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
+ goto should_delete;
+ }
+
+ if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
+ return SHOULD_DEFER_EVICTION;
+
+ /* Deletes should never happen under memory pressure anymore. */
+ if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
+ return SHOULD_DEFER_EVICTION;
+
+ /* Must not read inode block until block type has been verified */
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
+ if (unlikely(ret)) {
+ glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
+ ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+ return SHOULD_DEFER_EVICTION;
+ }
+
+ if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
+ return SHOULD_NOT_DELETE_DINODE;
+ ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
+ if (ret)
+ return SHOULD_NOT_DELETE_DINODE;
+
+ if (test_bit(GIF_INVALID, &ip->i_flags)) {
+ ret = gfs2_inode_refresh(ip);
+ if (ret)
+ return SHOULD_NOT_DELETE_DINODE;
+ }
+
+ /*
+ * The inode may have been recreated in the meantime.
+ */
+ if (inode->i_nlink)
+ return SHOULD_NOT_DELETE_DINODE;
+
+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)) {
+ gfs2_holder_uninit(&ip->i_iopen_gh);
+ return SHOULD_NOT_DELETE_DINODE;
+ }
+ }
+ return SHOULD_DELETE_DINODE;
+}
+
+/**
* evict_unlinked_inode - delete the pieces of an unlinked evicted inode
* @inode: The inode to evict
*/
@@ -1387,54 +1460,13 @@ static void gfs2_evict_inode(struct inode *inode)
if (inode->i_nlink || sb_rdonly(sb))
goto out;
- if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
- BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
- gfs2_holder_mark_uninitialized(&gh);
- goto out_delete;
- }
-
- if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
+ gfs2_holder_mark_uninitialized(&gh);
+ ret = evict_should_delete(inode, &gh);
+ if (ret == SHOULD_DEFER_EVICTION)
goto out;
-
- /* Deletes should never happen under memory pressure anymore. */
- if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
- goto out;
-
- /* Must not read inode block until block type has been verified */
- ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
- if (unlikely(ret)) {
- glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
- ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
- gfs2_glock_dq_uninit(&ip->i_iopen_gh);
- goto out;
- }
-
- if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
- goto out_truncate;
- ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
- if (ret)
- goto out_truncate;
-
- if (test_bit(GIF_INVALID, &ip->i_flags)) {
- ret = gfs2_inode_refresh(ip);
- if (ret)
- goto out_truncate;
- }
-
- /*
- * The inode may have been recreated in the meantime.
- */
- if (inode->i_nlink)
+ if (ret == SHOULD_NOT_DELETE_DINODE)
goto out_truncate;
-out_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)) {
- gfs2_holder_uninit(&ip->i_iopen_gh);
- goto out_truncate;
- }
- }
ret = evict_unlinked_inode(inode);
goto out_unlock;