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Diffstat (limited to 'fs/nilfs2/cpfile.c')
-rw-r--r--fs/nilfs2/cpfile.c294
1 files changed, 175 insertions, 119 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index e90b60dfced..0d58075f34e 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -216,14 +216,14 @@ int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
if (!nilfs_cpfile_is_in_first(cpfile, cno))
nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
kaddr, 1);
- nilfs_mdt_mark_buffer_dirty(cp_bh);
+ mark_buffer_dirty(cp_bh);
- kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(header_bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, header_bh,
kaddr);
le64_add_cpu(&header->ch_ncheckpoints, 1);
- kunmap_atomic(kaddr, KM_USER0);
- nilfs_mdt_mark_buffer_dirty(header_bh);
+ kunmap_atomic(kaddr);
+ mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(cpfile);
}
@@ -286,7 +286,7 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
__u64 cno;
void *kaddr;
unsigned long tnicps;
- int ret, ncps, nicps, count, i;
+ int ret, ncps, nicps, nss, count, i;
if (unlikely(start == 0 || start > end)) {
printk(KERN_ERR "%s: invalid range of checkpoint numbers: "
@@ -295,73 +295,79 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
return -EINVAL;
}
- /* cannot delete the latest checkpoint */
- if (start == nilfs_mdt_cno(cpfile) - 1)
- return -EPERM;
-
down_write(&NILFS_MDT(cpfile)->mi_sem);
ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
if (ret < 0)
goto out_sem;
tnicps = 0;
+ nss = 0;
for (cno = start; cno < end; cno += ncps) {
ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, end);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
if (ret < 0) {
if (ret != -ENOENT)
- goto out_sem;
+ break;
/* skip hole */
ret = 0;
continue;
}
- kaddr = kmap_atomic(cp_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(cp_bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(
cpfile, cno, cp_bh, kaddr);
nicps = 0;
for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
- WARN_ON(nilfs_checkpoint_snapshot(cp));
- if (!nilfs_checkpoint_invalid(cp)) {
+ if (nilfs_checkpoint_snapshot(cp)) {
+ nss++;
+ } else if (!nilfs_checkpoint_invalid(cp)) {
nilfs_checkpoint_set_invalid(cp);
nicps++;
}
}
if (nicps > 0) {
tnicps += nicps;
- nilfs_mdt_mark_buffer_dirty(cp_bh);
+ 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)) == 0) {
- /* make hole */
- kunmap_atomic(kaddr, KM_USER0);
- brelse(cp_bh);
- ret = nilfs_cpfile_delete_checkpoint_block(
- cpfile, cno);
- if (ret == 0)
- continue;
- printk(KERN_ERR "%s: cannot delete block\n",
- __func__);
- goto out_sem;
+ 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_atomic(kaddr);
+ brelse(cp_bh);
+ ret =
+ nilfs_cpfile_delete_checkpoint_block(
+ cpfile, cno);
+ if (ret == 0)
+ continue;
+ printk(KERN_ERR
+ "%s: cannot delete block\n",
+ __func__);
+ break;
+ }
}
}
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(cp_bh);
}
if (tnicps > 0) {
- kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(header_bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, header_bh,
kaddr);
le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
- nilfs_mdt_mark_buffer_dirty(header_bh);
+ mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(cpfile);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
}
+
brelse(header_bh);
+ if (nss > 0)
+ ret = -EBUSY;
out_sem:
up_write(&NILFS_MDT(cpfile)->mi_sem);
@@ -382,9 +388,10 @@ static void nilfs_cpfile_checkpoint_to_cpinfo(struct inode *cpfile,
}
static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
- struct nilfs_cpinfo *ci, size_t nci)
+ void *buf, unsigned cisz, size_t nci)
{
struct nilfs_checkpoint *cp;
+ struct nilfs_cpinfo *ci = buf;
struct buffer_head *bh;
size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
__u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
@@ -405,20 +412,25 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
continue; /* skip hole */
}
- kaddr = kmap_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
- if (!nilfs_checkpoint_invalid(cp))
- nilfs_cpfile_checkpoint_to_cpinfo(
- cpfile, cp, &ci[n++]);
+ if (!nilfs_checkpoint_invalid(cp)) {
+ nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
+ ci);
+ ci = (void *)ci + cisz;
+ n++;
+ }
}
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(bh);
}
ret = n;
- if (n > 0)
- *cnop = ci[n - 1].ci_cno + 1;
+ if (n > 0) {
+ ci = (void *)ci - cisz;
+ *cnop = ci->ci_cno + 1;
+ }
out:
up_read(&NILFS_MDT(cpfile)->mi_sem);
@@ -426,11 +438,12 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
}
static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
- struct nilfs_cpinfo *ci, size_t nci)
+ void *buf, unsigned cisz, size_t nci)
{
struct buffer_head *bh;
struct nilfs_cpfile_header *header;
struct nilfs_checkpoint *cp;
+ struct nilfs_cpinfo *ci = buf;
__u64 curr = *cnop, next;
unsigned long curr_blkoff, next_blkoff;
void *kaddr;
@@ -442,10 +455,10 @@ 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_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(bh);
if (curr == 0) {
ret = 0;
@@ -463,21 +476,23 @@ 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_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
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++]);
+ nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp, ci);
+ ci = (void *)ci + cisz;
+ 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);
+ kunmap_atomic(kaddr);
brelse(bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
0, &bh);
@@ -485,12 +500,12 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
WARN_ON(ret == -ENOENT);
goto out;
}
- kaddr = kmap_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
}
curr = next;
curr_blkoff = next_blkoff;
}
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(bh);
*cnop = curr;
ret = n;
@@ -509,13 +524,13 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
*/
ssize_t nilfs_cpfile_get_cpinfo(struct inode *cpfile, __u64 *cnop, int mode,
- struct nilfs_cpinfo *ci, size_t nci)
+ void *buf, unsigned cisz, size_t nci)
{
switch (mode) {
case NILFS_CHECKPOINT:
- return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, ci, nci);
+ return nilfs_cpfile_do_get_cpinfo(cpfile, cnop, buf, cisz, nci);
case NILFS_SNAPSHOT:
- return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, ci, nci);
+ return nilfs_cpfile_do_get_ssinfo(cpfile, cnop, buf, cisz, nci);
default:
return -EINVAL;
}
@@ -531,20 +546,14 @@ int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
struct nilfs_cpinfo ci;
__u64 tcno = cno;
ssize_t nci;
- int ret;
- nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, 1);
+ nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
if (nci < 0)
return nci;
else if (nci == 0 || ci.ci_cno != cno)
return -ENOENT;
-
- /* cannot delete the latest checkpoint nor snapshots */
- ret = nilfs_cpinfo_snapshot(&ci);
- if (ret < 0)
- return ret;
- else if (ret > 0 || cno == nilfs_mdt_cno(cpfile) - 1)
- return -EPERM;
+ else if (nilfs_cpinfo_snapshot(&ci))
+ return -EBUSY;
return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
}
@@ -587,24 +596,24 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
if (ret < 0)
goto out_sem;
- kaddr = kmap_atomic(cp_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(cp_bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
if (nilfs_checkpoint_invalid(cp)) {
ret = -ENOENT;
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
goto out_cp;
}
if (nilfs_checkpoint_snapshot(cp)) {
ret = 0;
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
goto out_cp;
}
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
if (ret < 0)
goto out_cp;
- kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(header_bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
list = &header->ch_snapshot_list;
curr_bh = header_bh;
@@ -616,13 +625,13 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
prev_blkoff = nilfs_cpfile_get_blkoff(cpfile, prev);
curr = prev;
if (curr_blkoff != prev_blkoff) {
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(curr_bh);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, curr,
0, &curr_bh);
if (ret < 0)
goto out_header;
- kaddr = kmap_atomic(curr_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(curr_bh->b_page);
}
curr_blkoff = prev_blkoff;
cp = nilfs_cpfile_block_get_checkpoint(
@@ -630,7 +639,7 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
list = &cp->cp_snapshot_list;
prev = le64_to_cpu(list->ssl_prev);
}
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
if (prev != 0) {
ret = nilfs_cpfile_get_checkpoint_block(cpfile, prev, 0,
@@ -642,34 +651,34 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
get_bh(prev_bh);
}
- kaddr = kmap_atomic(curr_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(curr_bh->b_page);
list = nilfs_cpfile_block_get_snapshot_list(
cpfile, curr, curr_bh, kaddr);
list->ssl_prev = cpu_to_le64(cno);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(cp_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(cp_bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
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_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(prev_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(prev_bh->b_page);
list = nilfs_cpfile_block_get_snapshot_list(
cpfile, prev, prev_bh, kaddr);
list->ssl_next = cpu_to_le64(cno);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(header_bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
le64_add_cpu(&header->ch_nsnapshots, 1);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- nilfs_mdt_mark_buffer_dirty(prev_bh);
- nilfs_mdt_mark_buffer_dirty(curr_bh);
- nilfs_mdt_mark_buffer_dirty(cp_bh);
- nilfs_mdt_mark_buffer_dirty(header_bh);
+ mark_buffer_dirty(prev_bh);
+ mark_buffer_dirty(curr_bh);
+ mark_buffer_dirty(cp_bh);
+ mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(cpfile);
brelse(prev_bh);
@@ -705,23 +714,23 @@ static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
if (ret < 0)
goto out_sem;
- kaddr = kmap_atomic(cp_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(cp_bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
if (nilfs_checkpoint_invalid(cp)) {
ret = -ENOENT;
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
goto out_cp;
}
if (!nilfs_checkpoint_snapshot(cp)) {
ret = 0;
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
goto out_cp;
}
list = &cp->cp_snapshot_list;
next = le64_to_cpu(list->ssl_next);
prev = le64_to_cpu(list->ssl_prev);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
if (ret < 0)
@@ -745,34 +754,34 @@ static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
get_bh(prev_bh);
}
- kaddr = kmap_atomic(next_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(next_bh->b_page);
list = nilfs_cpfile_block_get_snapshot_list(
cpfile, next, next_bh, kaddr);
list->ssl_prev = cpu_to_le64(prev);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(prev_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(prev_bh->b_page);
list = nilfs_cpfile_block_get_snapshot_list(
cpfile, prev, prev_bh, kaddr);
list->ssl_next = cpu_to_le64(next);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(cp_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(cp_bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
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_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(header_bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, header_bh, kaddr);
le64_add_cpu(&header->ch_nsnapshots, -1);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
- nilfs_mdt_mark_buffer_dirty(next_bh);
- nilfs_mdt_mark_buffer_dirty(prev_bh);
- nilfs_mdt_mark_buffer_dirty(cp_bh);
- nilfs_mdt_mark_buffer_dirty(header_bh);
+ mark_buffer_dirty(next_bh);
+ mark_buffer_dirty(prev_bh);
+ mark_buffer_dirty(cp_bh);
+ mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(cpfile);
brelse(prev_bh);
@@ -815,17 +824,22 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
void *kaddr;
int ret;
- if (cno == 0)
- return -ENOENT; /* checkpoint number 0 is invalid */
+ /* CP number is invalid if it's zero or larger than the
+ largest exist one.*/
+ if (cno == 0 || cno >= nilfs_mdt_cno(cpfile))
+ return -ENOENT;
down_read(&NILFS_MDT(cpfile)->mi_sem);
ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
if (ret < 0)
goto out;
- kaddr = kmap_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
- ret = nilfs_checkpoint_snapshot(cp);
- kunmap_atomic(kaddr, KM_USER0);
+ if (nilfs_checkpoint_invalid(cp))
+ ret = -ENOENT;
+ else
+ ret = nilfs_checkpoint_snapshot(cp);
+ kunmap_atomic(kaddr);
brelse(bh);
out:
@@ -853,29 +867,20 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
*/
int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode)
{
- struct the_nilfs *nilfs;
int ret;
- nilfs = NILFS_MDT(cpfile)->mi_nilfs;
-
switch (mode) {
case NILFS_CHECKPOINT:
- /*
- * Check for protecting existing snapshot mounts:
- * bd_mount_sem is used to make this operation atomic and
- * exclusive with a new mount job. Though it doesn't cover
- * umount, it's enough for the purpose.
- */
- down(&nilfs->ns_bdev->bd_mount_sem);
- if (nilfs_checkpoint_is_mounted(nilfs, cno, 1)) {
- /* Current implementation does not have to protect
- plain read-only mounts since they are exclusive
- with a read/write mount and are protected from the
- cleaner. */
+ if (nilfs_checkpoint_is_mounted(cpfile->i_sb, cno))
+ /*
+ * Current implementation does not have to protect
+ * plain read-only mounts since they are exclusive
+ * with a read/write mount and are protected from the
+ * cleaner.
+ */
ret = -EBUSY;
- } else
+ else
ret = nilfs_cpfile_clear_snapshot(cpfile, cno);
- up(&nilfs->ns_bdev->bd_mount_sem);
return ret;
case NILFS_SNAPSHOT:
return nilfs_cpfile_set_snapshot(cpfile, cno);
@@ -911,15 +916,66 @@ 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_atomic(bh->b_page, KM_USER0);
+ kaddr = kmap_atomic(bh->b_page);
header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
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_atomic(kaddr, KM_USER0);
+ kunmap_atomic(kaddr);
brelse(bh);
out_sem:
up_read(&NILFS_MDT(cpfile)->mi_sem);
return ret;
}
+
+/**
+ * nilfs_cpfile_read - read or get cpfile inode
+ * @sb: super block instance
+ * @cpsize: size of a checkpoint entry
+ * @raw_inode: on-disk cpfile inode
+ * @inodep: buffer to store the inode
+ */
+int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
+ struct nilfs_inode *raw_inode, struct inode **inodep)
+{
+ struct inode *cpfile;
+ int err;
+
+ if (cpsize > sb->s_blocksize) {
+ printk(KERN_ERR
+ "NILFS: too large checkpoint size: %zu bytes.\n",
+ cpsize);
+ return -EINVAL;
+ } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) {
+ printk(KERN_ERR
+ "NILFS: too small checkpoint size: %zu bytes.\n",
+ cpsize);
+ return -EINVAL;
+ }
+
+ cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
+ if (unlikely(!cpfile))
+ return -ENOMEM;
+ if (!(cpfile->i_state & I_NEW))
+ goto out;
+
+ err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
+ if (err)
+ goto failed;
+
+ nilfs_mdt_set_entry_size(cpfile, cpsize,
+ sizeof(struct nilfs_cpfile_header));
+
+ err = nilfs_read_inode_common(cpfile, raw_inode);
+ if (err)
+ goto failed;
+
+ unlock_new_inode(cpfile);
+ out:
+ *inodep = cpfile;
+ return 0;
+ failed:
+ iget_failed(cpfile);
+ return err;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-25 04:52:08 +0000