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Diffstat (limited to 'fs/nilfs2/cpfile.c')
-rw-r--r--fs/nilfs2/cpfile.c502
1 files changed, 264 insertions, 238 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 69a5cced1e84..bcc7d76269ac 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -68,54 +68,41 @@ static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile,
static unsigned int
nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile,
struct buffer_head *bh,
- void *kaddr,
unsigned int n)
{
- struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
+ struct nilfs_checkpoint *cp;
unsigned int count;
+ cp = kmap_local_folio(bh->b_folio,
+ offset_in_folio(bh->b_folio, bh->b_data));
count = le32_to_cpu(cp->cp_checkpoints_count) + n;
cp->cp_checkpoints_count = cpu_to_le32(count);
+ kunmap_local(cp);
return count;
}
static unsigned int
nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
struct buffer_head *bh,
- void *kaddr,
unsigned int n)
{
- struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
+ struct nilfs_checkpoint *cp;
unsigned int count;
+ cp = kmap_local_folio(bh->b_folio,
+ offset_in_folio(bh->b_folio, bh->b_data));
WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
count = le32_to_cpu(cp->cp_checkpoints_count) - n;
cp->cp_checkpoints_count = cpu_to_le32(count);
+ kunmap_local(cp);
return count;
}
-static inline struct nilfs_cpfile_header *
-nilfs_cpfile_block_get_header(const struct inode *cpfile,
- struct buffer_head *bh,
- void *kaddr)
-{
- return kaddr + bh_offset(bh);
-}
-
-static struct nilfs_checkpoint *
-nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno,
- struct buffer_head *bh,
- void *kaddr)
-{
- return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) *
- NILFS_MDT(cpfile)->mi_entry_size;
-}
-
static void nilfs_cpfile_block_init(struct inode *cpfile,
struct buffer_head *bh,
- void *kaddr)
+ void *from)
{
- struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
+ struct nilfs_checkpoint *cp = from;
size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
int n = nilfs_cpfile_checkpoints_per_block(cpfile);
@@ -125,10 +112,65 @@ static void nilfs_cpfile_block_init(struct inode *cpfile,
}
}
-static inline int nilfs_cpfile_get_header_block(struct inode *cpfile,
- struct buffer_head **bhp)
+/**
+ * nilfs_cpfile_checkpoint_offset - calculate the byte offset of a checkpoint
+ * entry in the folio containing it
+ * @cpfile: checkpoint file inode
+ * @cno: checkpoint number
+ * @bh: buffer head of block containing checkpoint indexed by @cno
+ *
+ * Return: Byte offset in the folio of the checkpoint specified by @cno.
+ */
+static size_t nilfs_cpfile_checkpoint_offset(const struct inode *cpfile,
+ __u64 cno,
+ struct buffer_head *bh)
+{
+ return offset_in_folio(bh->b_folio, bh->b_data) +
+ nilfs_cpfile_get_offset(cpfile, cno) *
+ NILFS_MDT(cpfile)->mi_entry_size;
+}
+
+/**
+ * nilfs_cpfile_cp_snapshot_list_offset - calculate the byte offset of a
+ * checkpoint snapshot list in the folio
+ * containing it
+ * @cpfile: checkpoint file inode
+ * @cno: checkpoint number
+ * @bh: buffer head of block containing checkpoint indexed by @cno
+ *
+ * Return: Byte offset in the folio of the checkpoint snapshot list specified
+ * by @cno.
+ */
+static size_t nilfs_cpfile_cp_snapshot_list_offset(const struct inode *cpfile,
+ __u64 cno,
+ struct buffer_head *bh)
+{
+ return nilfs_cpfile_checkpoint_offset(cpfile, cno, bh) +
+ offsetof(struct nilfs_checkpoint, cp_snapshot_list);
+}
+
+/**
+ * nilfs_cpfile_ch_snapshot_list_offset - calculate the byte offset of the
+ * snapshot list in the header
+ *
+ * Return: Byte offset in the folio of the checkpoint snapshot list
+ */
+static size_t nilfs_cpfile_ch_snapshot_list_offset(void)
{
- return nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp);
+ return offsetof(struct nilfs_cpfile_header, ch_snapshot_list);
+}
+
+static int nilfs_cpfile_get_header_block(struct inode *cpfile,
+ struct buffer_head **bhp)
+{
+ int err = nilfs_mdt_get_block(cpfile, 0, 0, NULL, bhp);
+
+ if (unlikely(err == -ENOENT)) {
+ nilfs_error(cpfile->i_sb,
+ "missing header block in checkpoint metadata");
+ err = -EIO;
+ }
+ return err;
}
static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
@@ -149,14 +191,11 @@ static inline int nilfs_cpfile_get_checkpoint_block(struct inode *cpfile,
* @cnop: place to store the next checkpoint number
* @bhp: place to store a pointer to buffer_head struct
*
- * Return Value: On success, it returns 0. On error, the following negative
- * error code is returned.
- *
- * %-ENOMEM - Insufficient memory available.
- *
- * %-EIO - I/O error
- *
- * %-ENOENT - no block exists in the range.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOENT - no block exists in the range.
+ * * %-ENOMEM - Insufficient memory available.
*/
static int nilfs_cpfile_find_checkpoint_block(struct inode *cpfile,
__u64 start_cno, __u64 end_cno,
@@ -197,7 +236,8 @@ static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
* stores it to the inode file given by @ifile and the nilfs root object
* given by @root.
*
- * Return: 0 on success, or the following negative error code on failure.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
* * %-EINVAL - Invalid checkpoint.
* * %-ENOMEM - Insufficient memory available.
* * %-EIO - I/O error (including metadata corruption).
@@ -207,7 +247,7 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
{
struct buffer_head *cp_bh;
struct nilfs_checkpoint *cp;
- void *kaddr;
+ size_t offset;
int ret;
if (cno < 1 || cno > nilfs_mdt_cno(cpfile))
@@ -221,8 +261,8 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
goto out_sem;
}
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
if (nilfs_checkpoint_invalid(cp)) {
ret = -EINVAL;
goto put_cp;
@@ -247,7 +287,7 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
root->ifile = ifile;
put_cp:
- kunmap_local(kaddr);
+ kunmap_local(cp);
brelse(cp_bh);
out_sem:
up_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -265,7 +305,8 @@ out_sem:
* In either case, the buffer of the block containing the checkpoint entry
* and the cpfile inode are made dirty for inclusion in the write log.
*
- * Return: 0 on success, or the following negative error code on failure.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
* * %-ENOMEM - Insufficient memory available.
* * %-EIO - I/O error (including metadata corruption).
* * %-EROFS - Read only filesystem
@@ -275,7 +316,7 @@ int nilfs_cpfile_create_checkpoint(struct inode *cpfile, __u64 cno)
struct buffer_head *header_bh, *cp_bh;
struct nilfs_cpfile_header *header;
struct nilfs_checkpoint *cp;
- void *kaddr;
+ size_t offset;
int ret;
if (WARN_ON_ONCE(cno < 1))
@@ -283,36 +324,29 @@ int nilfs_cpfile_create_checkpoint(struct inode *cpfile, __u64 cno)
down_write(&NILFS_MDT(cpfile)->mi_sem);
ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
- if (unlikely(ret < 0)) {
- if (ret == -ENOENT) {
- nilfs_error(cpfile->i_sb,
- "checkpoint creation failed due to metadata corruption.");
- ret = -EIO;
- }
+ if (unlikely(ret < 0))
goto out_sem;
- }
+
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 1, &cp_bh);
if (unlikely(ret < 0))
goto out_header;
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
if (nilfs_checkpoint_invalid(cp)) {
/* a newly-created checkpoint */
nilfs_checkpoint_clear_invalid(cp);
+ kunmap_local(cp);
if (!nilfs_cpfile_is_in_first(cpfile, cno))
nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
- kaddr, 1);
- kunmap_local(kaddr);
+ 1);
- kaddr = kmap_local_page(header_bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, header_bh,
- kaddr);
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->ch_ncheckpoints, 1);
- kunmap_local(kaddr);
+ kunmap_local(header);
mark_buffer_dirty(header_bh);
} else {
- kunmap_local(kaddr);
+ kunmap_local(cp);
}
/* Force the buffer and the inode to become dirty */
@@ -341,7 +375,8 @@ out_sem:
* cpfile with the data given by the arguments @root, @blkinc, @ctime, and
* @minor.
*
- * Return: 0 on success, or the following negative error code on failure.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
* * %-ENOMEM - Insufficient memory available.
* * %-EIO - I/O error (including metadata corruption).
*/
@@ -351,7 +386,7 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
{
struct buffer_head *cp_bh;
struct nilfs_checkpoint *cp;
- void *kaddr;
+ size_t offset;
int ret;
if (WARN_ON_ONCE(cno < 1))
@@ -365,10 +400,10 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
goto out_sem;
}
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
if (unlikely(nilfs_checkpoint_invalid(cp))) {
- kunmap_local(kaddr);
+ kunmap_local(cp);
brelse(cp_bh);
goto error;
}
@@ -389,7 +424,7 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
nilfs_write_inode_common(root->ifile, &cp->cp_ifile_inode);
nilfs_bmap_write(NILFS_I(root->ifile)->i_bmap, &cp->cp_ifile_inode);
- kunmap_local(kaddr);
+ kunmap_local(cp);
brelse(cp_bh);
out_sem:
up_write(&NILFS_MDT(cpfile)->mi_sem);
@@ -412,14 +447,11 @@ error:
* the period from @start to @end, excluding @end itself. The checkpoints
* which have been already deleted are ignored.
*
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-EINVAL - invalid checkpoints.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Invalid checkpoints.
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
__u64 start,
@@ -430,6 +462,7 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
struct nilfs_checkpoint *cp;
size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
__u64 cno;
+ size_t offset;
void *kaddr;
unsigned long tnicps;
int ret, ncps, nicps, nss, count, i;
@@ -460,9 +493,8 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
continue;
}
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(
- cpfile, cno, cp_bh, kaddr);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kaddr = kmap_local_folio(cp_bh->b_folio, offset);
nicps = 0;
for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
if (nilfs_checkpoint_snapshot(cp)) {
@@ -472,43 +504,42 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
nicps++;
}
}
- if (nicps > 0) {
- tnicps += nicps;
- mark_buffer_dirty(cp_bh);
- nilfs_mdt_mark_dirty(cpfile);
- if (!nilfs_cpfile_is_in_first(cpfile, cno)) {
- count =
- nilfs_cpfile_block_sub_valid_checkpoints(
- cpfile, cp_bh, kaddr, nicps);
- if (count == 0) {
- /* make hole */
- kunmap_local(kaddr);
- brelse(cp_bh);
- ret =
- nilfs_cpfile_delete_checkpoint_block(
- cpfile, cno);
- if (ret == 0)
- continue;
- nilfs_err(cpfile->i_sb,
- "error %d deleting checkpoint block",
- ret);
- break;
- }
- }
+ kunmap_local(kaddr);
+
+ if (nicps <= 0) {
+ brelse(cp_bh);
+ continue;
}
- kunmap_local(kaddr);
+ tnicps += nicps;
+ mark_buffer_dirty(cp_bh);
+ nilfs_mdt_mark_dirty(cpfile);
+ if (nilfs_cpfile_is_in_first(cpfile, cno)) {
+ brelse(cp_bh);
+ continue;
+ }
+
+ count = nilfs_cpfile_block_sub_valid_checkpoints(cpfile, cp_bh,
+ nicps);
brelse(cp_bh);
+ if (count)
+ continue;
+
+ /* Delete the block if there are no more valid checkpoints */
+ ret = nilfs_cpfile_delete_checkpoint_block(cpfile, cno);
+ if (unlikely(ret)) {
+ nilfs_err(cpfile->i_sb,
+ "error %d deleting checkpoint block", ret);
+ break;
+ }
}
if (tnicps > 0) {
- kaddr = kmap_local_page(header_bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, header_bh,
- kaddr);
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(cpfile);
- kunmap_local(kaddr);
+ kunmap_local(header);
}
brelse(header_bh);
@@ -542,6 +573,7 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
struct buffer_head *bh;
size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
__u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
+ size_t offset;
void *kaddr;
int n, ret;
int ncps, i;
@@ -560,8 +592,8 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
}
ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
- kaddr = kmap_local_page(bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, bh);
+ cp = kaddr = kmap_local_folio(bh->b_folio, offset);
for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
if (!nilfs_checkpoint_invalid(cp)) {
nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
@@ -595,7 +627,7 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
struct nilfs_cpinfo *ci = buf;
__u64 curr = *cnop, next;
unsigned long curr_blkoff, next_blkoff;
- void *kaddr;
+ size_t offset;
int n = 0, ret;
down_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -604,10 +636,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
ret = nilfs_cpfile_get_header_block(cpfile, &bh);
if (ret < 0)
goto out;
- kaddr = kmap_local_page(bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
+ header = kmap_local_folio(bh->b_folio, 0);
curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
- kunmap_local(kaddr);
+ kunmap_local(header);
brelse(bh);
if (curr == 0) {
ret = 0;
@@ -625,9 +656,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
ret = 0; /* No snapshots (started from a hole block) */
goto out;
}
- kaddr = kmap_local_page(bh->b_page);
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, curr, bh);
+ cp = kmap_local_folio(bh->b_folio, offset);
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)))
@@ -639,9 +670,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
if (next == 0)
break; /* reach end of the snapshot list */
+ kunmap_local(cp);
next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
if (curr_blkoff != next_blkoff) {
- kunmap_local(kaddr);
brelse(bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
0, &bh);
@@ -649,12 +680,13 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
WARN_ON(ret == -ENOENT);
goto out;
}
- kaddr = kmap_local_page(bh->b_page);
}
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, next, bh);
+ cp = kmap_local_folio(bh->b_folio, offset);
curr = next;
curr_blkoff = next_blkoff;
}
- kunmap_local(kaddr);
+ kunmap_local(cp);
brelse(bh);
*cnop = curr;
ret = n;
@@ -683,7 +715,7 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
* number to continue searching.
*
* Return: Count of checkpoint info items stored in the output buffer on
- * success, or the following negative error code on failure.
+ * success, or one of the following negative error codes on failure:
* * %-EINVAL - Invalid checkpoint mode.
* * %-ENOMEM - Insufficient memory available.
* * %-EIO - I/O error (including metadata corruption).
@@ -704,9 +736,16 @@ ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
}
/**
- * nilfs_cpfile_delete_checkpoint -
- * @cpfile:
- * @cno:
+ * nilfs_cpfile_delete_checkpoint - delete a checkpoint
+ * @cpfile: checkpoint file inode
+ * @cno: checkpoint number to delete
+ *
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EBUSY - Checkpoint in use (snapshot specified).
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOENT - No valid checkpoint found.
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
{
@@ -725,26 +764,6 @@ int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
}
-static struct nilfs_snapshot_list *
-nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile,
- __u64 cno,
- struct buffer_head *bh,
- void *kaddr)
-{
- struct nilfs_cpfile_header *header;
- struct nilfs_checkpoint *cp;
- struct nilfs_snapshot_list *list;
-
- if (cno != 0) {
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
- list = &cp->cp_snapshot_list;
- } else {
- header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
- list = &header->ch_snapshot_list;
- }
- return list;
-}
-
static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
{
struct buffer_head *header_bh, *curr_bh, *prev_bh, *cp_bh;
@@ -753,94 +772,103 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
struct nilfs_snapshot_list *list;
__u64 curr, prev;
unsigned long curr_blkoff, prev_blkoff;
- void *kaddr;
+ size_t offset, curr_list_offset, prev_list_offset;
int ret;
if (cno == 0)
return -ENOENT; /* checkpoint number 0 is invalid */
down_write(&NILFS_MDT(cpfile)->mi_sem);
+ ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
+ if (unlikely(ret < 0))
+ goto out_sem;
+
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
if (ret < 0)
- goto out_sem;
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ goto out_header;
+
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
if (nilfs_checkpoint_invalid(cp)) {
ret = -ENOENT;
- kunmap_local(kaddr);
+ kunmap_local(cp);
goto out_cp;
}
if (nilfs_checkpoint_snapshot(cp)) {
ret = 0;
- kunmap_local(kaddr);
+ kunmap_local(cp);
goto out_cp;
}
- kunmap_local(kaddr);
+ kunmap_local(cp);
- ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
- if (ret < 0)
- goto out_cp;
- kaddr = kmap_local_page(header_bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
+ /*
+ * Find the last snapshot before the checkpoint being changed to
+ * snapshot mode by going backwards through the snapshot list.
+ * Set "prev" to its checkpoint number, or 0 if not found.
+ */
+ header = kmap_local_folio(header_bh->b_folio, 0);
list = &header->ch_snapshot_list;
curr_bh = header_bh;
get_bh(curr_bh);
curr = 0;
curr_blkoff = 0;
+ curr_list_offset = nilfs_cpfile_ch_snapshot_list_offset();
prev = le64_to_cpu(list->ssl_prev);
while (prev > cno) {
prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev);
curr = prev;
+ kunmap_local(list);
if (curr_blkoff != prev_blkoff) {
- kunmap_local(kaddr);
brelse(curr_bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
0, &curr_bh);
- if (ret < 0)
- goto out_header;
- kaddr = kmap_local_page(curr_bh->b_page);
+ if (unlikely(ret < 0))
+ goto out_cp;
}
+ curr_list_offset = nilfs_cpfile_cp_snapshot_list_offset(
+ cpfile, curr, curr_bh);
+ list = kmap_local_folio(curr_bh->b_folio, curr_list_offset);
curr_blkoff = prev_blkoff;
- cp = nilfs_cpfile_block_get_checkpoint(
- cpfile, curr, curr_bh, kaddr);
- list = &cp->cp_snapshot_list;
prev = le64_to_cpu(list->ssl_prev);
}
- kunmap_local(kaddr);
+ kunmap_local(list);
if (prev != 0) {
ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
&prev_bh);
if (ret < 0)
goto out_curr;
+
+ prev_list_offset = nilfs_cpfile_cp_snapshot_list_offset(
+ cpfile, prev, prev_bh);
} else {
prev_bh = header_bh;
get_bh(prev_bh);
+ prev_list_offset = nilfs_cpfile_ch_snapshot_list_offset();
}
- kaddr = kmap_local_page(curr_bh->b_page);
- list = nilfs_cpfile_block_get_snapshot_list(
- cpfile, curr, curr_bh, kaddr);
+ /* Update the list entry for the next snapshot */
+ list = kmap_local_folio(curr_bh->b_folio, curr_list_offset);
list->ssl_prev = cpu_to_le64(cno);
- kunmap_local(kaddr);
+ kunmap_local(list);
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ /* Update the checkpoint being changed to a snapshot */
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
cp->cp_snapshot_list.ssl_next = cpu_to_le64(curr);
cp->cp_snapshot_list.ssl_prev = cpu_to_le64(prev);
nilfs_checkpoint_set_snapshot(cp);
- kunmap_local(kaddr);
+ kunmap_local(cp);
- kaddr = kmap_local_page(prev_bh->b_page);
- list = nilfs_cpfile_block_get_snapshot_list(
- cpfile, prev, prev_bh, kaddr);
+ /* Update the list entry for the previous snapshot */
+ list = kmap_local_folio(prev_bh->b_folio, prev_list_offset);
list->ssl_next = cpu_to_le64(cno);
- kunmap_local(kaddr);
+ kunmap_local(list);
- kaddr = kmap_local_page(header_bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
+ /* Update the statistics in the header */
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->ch_nsnapshots, 1);
- kunmap_local(kaddr);
+ kunmap_local(header);
mark_buffer_dirty(prev_bh);
mark_buffer_dirty(curr_bh);
@@ -853,12 +881,12 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
out_curr:
brelse(curr_bh);
- out_header:
- brelse(header_bh);
-
out_cp:
brelse(cp_bh);
+ out_header:
+ brelse(header_bh);
+
out_sem:
up_write(&NILFS_MDT(cpfile)->mi_sem);
return ret;
@@ -871,79 +899,87 @@ static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
struct nilfs_checkpoint *cp;
struct nilfs_snapshot_list *list;
__u64 next, prev;
- void *kaddr;
+ size_t offset, next_list_offset, prev_list_offset;
int ret;
if (cno == 0)
return -ENOENT; /* checkpoint number 0 is invalid */
down_write(&NILFS_MDT(cpfile)->mi_sem);
+ ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
+ if (unlikely(ret < 0))
+ goto out_sem;
+
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
if (ret < 0)
- goto out_sem;
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ goto out_header;
+
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
if (nilfs_checkpoint_invalid(cp)) {
ret = -ENOENT;
- kunmap_local(kaddr);
+ kunmap_local(cp);
goto out_cp;
}
if (!nilfs_checkpoint_snapshot(cp)) {
ret = 0;
- kunmap_local(kaddr);
+ kunmap_local(cp);
goto out_cp;
}
list = &cp->cp_snapshot_list;
next = le64_to_cpu(list->ssl_next);
prev = le64_to_cpu(list->ssl_prev);
- kunmap_local(kaddr);
+ kunmap_local(cp);
- ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
- if (ret < 0)
- goto out_cp;
if (next != 0) {
ret = nilfs_cpfile_get_checkpoint_block(cpfile, next, 0,
&next_bh);
if (ret < 0)
- goto out_header;
+ goto out_cp;
+
+ next_list_offset = nilfs_cpfile_cp_snapshot_list_offset(
+ cpfile, next, next_bh);
} else {
next_bh = header_bh;
get_bh(next_bh);
+ next_list_offset = nilfs_cpfile_ch_snapshot_list_offset();
}
if (prev != 0) {
ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
&prev_bh);
if (ret < 0)
goto out_next;
+
+ prev_list_offset = nilfs_cpfile_cp_snapshot_list_offset(
+ cpfile, prev, prev_bh);
} else {
prev_bh = header_bh;
get_bh(prev_bh);
+ prev_list_offset = nilfs_cpfile_ch_snapshot_list_offset();
}
- kaddr = kmap_local_page(next_bh->b_page);
- list = nilfs_cpfile_block_get_snapshot_list(
- cpfile, next, next_bh, kaddr);
+ /* Update the list entry for the next snapshot */
+ list = kmap_local_folio(next_bh->b_folio, next_list_offset);
list->ssl_prev = cpu_to_le64(prev);
- kunmap_local(kaddr);
+ kunmap_local(list);
- kaddr = kmap_local_page(prev_bh->b_page);
- list = nilfs_cpfile_block_get_snapshot_list(
- cpfile, prev, prev_bh, kaddr);
+ /* Update the list entry for the previous snapshot */
+ list = kmap_local_folio(prev_bh->b_folio, prev_list_offset);
list->ssl_next = cpu_to_le64(next);
- kunmap_local(kaddr);
+ kunmap_local(list);
- kaddr = kmap_local_page(cp_bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
+ /* Update the snapshot being changed back to a plain checkpoint */
+ cp = kmap_local_folio(cp_bh->b_folio, offset);
cp->cp_snapshot_list.ssl_next = cpu_to_le64(0);
cp->cp_snapshot_list.ssl_prev = cpu_to_le64(0);
nilfs_checkpoint_clear_snapshot(cp);
- kunmap_local(kaddr);
+ kunmap_local(cp);
- kaddr = kmap_local_page(header_bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
+ /* Update the statistics in the header */
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->ch_nsnapshots, -1);
- kunmap_local(kaddr);
+ kunmap_local(header);
mark_buffer_dirty(next_bh);
mark_buffer_dirty(prev_bh);
@@ -956,39 +992,33 @@ static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
out_next:
brelse(next_bh);
- out_header:
- brelse(header_bh);
-
out_cp:
brelse(cp_bh);
+ out_header:
+ brelse(header_bh);
+
out_sem:
up_write(&NILFS_MDT(cpfile)->mi_sem);
return ret;
}
/**
- * nilfs_cpfile_is_snapshot -
+ * nilfs_cpfile_is_snapshot - determine if checkpoint is a snapshot
* @cpfile: inode of checkpoint file
- * @cno: checkpoint number
- *
- * Description:
- *
- * Return Value: On success, 1 is returned if the checkpoint specified by
- * @cno is a snapshot, or 0 if not. On error, one of the following negative
- * error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
+ * @cno: checkpoint number
*
- * %-ENOENT - No such checkpoint.
+ * Return: 1 if the checkpoint specified by @cno is a snapshot, 0 if not, or
+ * one of the following negative error codes on failure:
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOENT - No such checkpoint.
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
{
struct buffer_head *bh;
struct nilfs_checkpoint *cp;
- void *kaddr;
+ size_t offset;
int ret;
/*
@@ -1002,13 +1032,14 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
if (ret < 0)
goto out;
- kaddr = kmap_local_page(bh->b_page);
- cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
+
+ offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, bh);
+ cp = kmap_local_folio(bh->b_folio, offset);
if (nilfs_checkpoint_invalid(cp))
ret = -ENOENT;
else
ret = nilfs_checkpoint_snapshot(cp);
- kunmap_local(kaddr);
+ kunmap_local(cp);
brelse(bh);
out:
@@ -1025,14 +1056,11 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
* Description: nilfs_change_cpmode() changes the mode of the checkpoint
* specified by @cno. The mode @mode is NILFS_CHECKPOINT or NILFS_SNAPSHOT.
*
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOENT - No such checkpoint.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOENT - No such checkpoint.
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
@@ -1064,20 +1092,17 @@ int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
* @cpstat: pointer to a structure of checkpoint statistics
*
* Description: nilfs_cpfile_get_stat() returns information about checkpoints.
+ * The checkpoint statistics are stored in the location pointed to by @cpstat.
*
- * Return Value: On success, 0 is returned, and checkpoints information is
- * stored in the place pointed by @cpstat. On error, one of the following
- * negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
{
struct buffer_head *bh;
struct nilfs_cpfile_header *header;
- void *kaddr;
int ret;
down_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -1085,12 +1110,11 @@ int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
ret = nilfs_cpfile_get_header_block(cpfile, &bh);
if (ret < 0)
goto out_sem;
- kaddr = kmap_local_page(bh->b_page);
- header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
+ header = kmap_local_folio(bh->b_folio, 0);
cpstat->cs_cno = nilfs_mdt_cno(cpfile);
cpstat->cs_ncps = le64_to_cpu(header->ch_ncheckpoints);
cpstat->cs_nsss = le64_to_cpu(header->ch_nsnapshots);
- kunmap_local(kaddr);
+ kunmap_local(header);
brelse(bh);
out_sem:
@@ -1104,6 +1128,8 @@ int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
* @cpsize: size of a checkpoint entry
* @raw_inode: on-disk cpfile inode
* @inodep: buffer to store the inode
+ *
+ * Return: 0 on success, or a negative error code on failure.
*/
int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
struct nilfs_inode *raw_inode, struct inode **inodep)
generated by cgit (git 2.34.1) at 2025-07-23 22:38:07 +0000