The patch titled
nilfs2: fix improper return values of nilfs_get_cpinfo ioctl
has been added to the -mm tree. Its filename is
nilfs2-fix-improper-return-values-of-nilfs_get_cpinfo-ioctl.patch
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------------------------------------------------------
Subject: nilfs2: fix improper return values of nilfs_get_cpinfo ioctl
From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
A few tool developers gave me requests for fixing inconvenient return
value of nilfs_get_cpinfo() ioctl; if the requested mode is NILFS_SNAPSHOT
and the specified start entry is not a snapshot, the ioctl unnaturally
returns one as the number of acquired snapshot item.
In addition, the ioctl function returns an ENOENT error for checkpoints
within blocks deleted by garbage collection.
These behaviors require corrections for programs which enumerate
snapshots. This resolves the inconvenience by changing the return values
to zero for the above cases.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nilfs2/cpfile.c | 30 ++++++++++++++++++------------
1 file changed, 18 insertions(+), 12 deletions(-)
diff -puN fs/nilfs2/cpfile.c~nilfs2-fix-improper-return-values-of-nilfs_get_cpinfo-ioctl fs/nilfs2/cpfile.c
--- a/fs/nilfs2/cpfile.c~nilfs2-fix-improper-return-values-of-nilfs_get_cpinfo-ioctl
+++ a/fs/nilfs2/cpfile.c
@@ -431,7 +431,7 @@ static ssize_t nilfs_cpfile_do_get_ssinf
__u64 curr = *cnop, next;
unsigned long curr_blkoff, next_blkoff;
void *kaddr;
- int n, ret;
+ int n = 0, ret;
down_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -455,27 +455,33 @@ static ssize_t nilfs_cpfile_do_get_ssinf
curr_blkoff = nilfs_cpfile_get_blkoff(cpfile, curr);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr, 0, &bh);
- if (ret < 0)
+ if (unlikely(ret < 0)) {
+ if (ret == -ENOENT)
+ ret = 0; /* No snapshots (started from a hole block) */
goto out;
+ }
kaddr = kmap_atomic(bh->b_page, KM_USER0);
- for (n = 0; n < nci; n++) {
- cp = nilfs_cpfile_block_get_checkpoint(
- cpfile, curr, bh, kaddr);
- nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, &ci[n]);
- next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
- if (next == 0) {
- curr = ~(__u64)0; /* Terminator */
- n++;
+ while (n < nci) {
+ cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
+ curr = ~(__u64)0; /* Terminator */
+ if (unlikely(nilfs_checkpoint_invalid(cp) ||
+ !nilfs_checkpoint_snapshot(cp)))
break;
- }
+ nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, &ci[n++]);
+ next = le64_to_cpu(cp->cp_snapshot_list.ssl_next);
+ if (next == 0)
+ break; /* reach end of the snapshot list */
+
next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
if (curr_blkoff != next_blkoff) {
kunmap_atomic(kaddr, KM_USER0);
brelse(bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
0, &bh);
- if (ret < 0)
+ if (unlikely(ret < 0)) {
+ WARN_ON(ret == -ENOENT);
goto out;
+ }
kaddr = kmap_atomic(bh->b_page, KM_USER0);
}
curr = next;
_
Patches currently in -mm which might be from konishi.ryusuke@xxxxxxxxxxxxx are
nilfs2-add-document.patch
nilfs2-disk-format-and-userland-interface.patch
nilfs2-add-inode-and-other-major-structures.patch
nilfs2-integrated-block-mapping.patch
nilfs2-integrated-block-mapping-remove-nilfs-bmap-wrapper-macros.patch
nilfs2-integrated-block-mapping-remove-nilfs-bmap-wrapper-macros-checkpatch-fixes.patch
nilfs2-b-tree-based-block-mapping.patch
nilfs2-direct-block-mapping.patch
nilfs2-b-tree-node-cache.patch
nilfs2-buffer-and-page-operations.patch
nilfs2-meta-data-file.patch
nilfs2-persistent-object-allocator.patch
nilfs2-disk-address-translator.patch
nilfs2-inode-map-file.patch
nilfs2-checkpoint-file.patch
nilfs2-segment-usage-file.patch
nilfs2-segment-usage-file-fix-wrong-counting-of-checkpoints-and-dirty-segments.patch
nilfs2-inode-operations.patch
nilfs2-inode-operations-fix.patch
nilfs2-file-operations.patch
nilfs2-directory-entry-operations.patch
nilfs2-pathname-operations.patch
nilfs2-pathname-operations-fix.patch
nilfs2-operations-for-the_nilfs-core-object.patch
nilfs2-super-block-operations.patch
nilfs2-super-block-operations-fix.patch
nilfs2-segment-buffer.patch
nilfs2-segment-buffer-fix.patch
nilfs2-segment-constructor.patch
nilfs2-segment-constructor-insert-checks-and-hole-block-allocation-in-page_mkwrite.patch
nilfs2-segment-constructor-insert-checks-and-hole-block-allocation-in-page_mkwrite-follow-page_mkwrite-prototype-change-for-matching-fault.patch
nilfs2-segment-constructor-insert-checks-and-hole-block-allocation-in-page_mkwrite-follow-page_mkwrite-prototype-change-for-matching-fault-fix-page_mkwrite-error-cases.patch
nilfs2-fix-miss-sync-issue-for-do_sync_mapping_range.patch
nilfs2-fix-miss-sync-issue-for-do_sync_mapping_range-fix.patch
nilfs2-recovery-functions.patch
nilfs2-another-dat-for-garbage-collection.patch
nilfs2-block-cache-for-garbage-collection.patch
nilfs2-ioctl-operations.patch
nilfs2-update-makefile-and-kconfig.patch
nilfs2-fix-problems-of-memory-allocation-in-ioctl.patch
nilfs2-cleanup-nilfs_clear_inode.patch
nilfs2-avoid-double-error-caused-by-nilfs_transaction_end.patch
nilfs2-insert-explanations-in-gcinode-file.patch
nilfs2-add-maintainer.patch
nilfs2-fix-gc-failure-on-volumes-keeping-numerous-snapshots.patch
nilfs2-fix-improper-return-values-of-nilfs_get_cpinfo-ioctl.patch
nilfs2-clean-up-indirect-function-calling-conventions.patch
nilfs2-fix-buggy-behavior-seen-in-enumerating-checkpoints.patch
nilfs2-remove-timedwait-ioctl-command.patch
nilfs2-use-fixed-sized-types-for-ioctl-structures.patch
nilfs2-remove-compat-ioctl-code.patch
nilfs2-use-unlocked_ioctl.patch
nilfs2-extend-nilfs_sustat-ioctl-struct.patch
nilfs2-replace-bug_on-and-bug-calls-triggerable-from-ioctl.patch
nilfs2-super-block-operations-fix-endian-bug.patch
nilfs2-clean-up-sketch-file.patch
nilfs2-mark-minor-flag-for-checkpoint-created-by-internal-operation.patch
nilfs2-simplify-handling-of-active-state-of-segments.patch
nilfs2-introduce-secondary-super-block.patch
nilfs2-introduce-secondary-super-block-fix.patch
nilfs2-support-nanosecond-timestamp.patch
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