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Diffstat (limited to 'fs/nilfs2/sufile.c')
-rw-r--r--fs/nilfs2/sufile.c388
1 files changed, 221 insertions, 167 deletions
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index e385cca2004a..83f93337c01b 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -48,7 +48,7 @@ nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum)
{
__u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset;
- do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
+ t = div64_ul(t, nilfs_sufile_segment_usages_per_block(sufile));
return (unsigned long)t;
}
@@ -70,19 +70,35 @@ nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr,
max - curr + 1);
}
-static struct nilfs_segment_usage *
-nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum,
- struct buffer_head *bh, void *kaddr)
+/**
+ * nilfs_sufile_segment_usage_offset - calculate the byte offset of a segment
+ * usage entry in the folio containing it
+ * @sufile: segment usage file inode
+ * @segnum: number of segment usage
+ * @bh: buffer head of block containing segment usage indexed by @segnum
+ *
+ * Return: Byte offset in the folio of the segment usage entry.
+ */
+static size_t nilfs_sufile_segment_usage_offset(const struct inode *sufile,
+ __u64 segnum,
+ struct buffer_head *bh)
{
- return kaddr + bh_offset(bh) +
+ return offset_in_folio(bh->b_folio, bh->b_data) +
nilfs_sufile_get_offset(sufile, segnum) *
NILFS_MDT(sufile)->mi_entry_size;
}
-static inline int nilfs_sufile_get_header_block(struct inode *sufile,
- struct buffer_head **bhp)
+static int nilfs_sufile_get_header_block(struct inode *sufile,
+ struct buffer_head **bhp)
{
- return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
+ int err = nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp);
+
+ if (unlikely(err == -ENOENT)) {
+ nilfs_error(sufile->i_sb,
+ "missing header block in segment usage metadata");
+ err = -EIO;
+ }
+ return err;
}
static inline int
@@ -105,13 +121,11 @@ static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
u64 ncleanadd, u64 ndirtyadd)
{
struct nilfs_sufile_header *header;
- void *kaddr;
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
mark_buffer_dirty(header_bh);
}
@@ -119,6 +133,8 @@ static void nilfs_sufile_mod_counter(struct buffer_head *header_bh,
/**
* nilfs_sufile_get_ncleansegs - return the number of clean segments
* @sufile: inode of segment usage file
+ *
+ * Return: Number of clean segments.
*/
unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
{
@@ -141,17 +157,13 @@ unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile)
* of successfully modified segments from the head is stored in the
* place @ndone points to.
*
- * Return Value: On success, zero is returned. On error, one of the
- * following negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOENT - Given segment usage is in hole block (may be returned if
- * @create is zero)
- *
- * %-EINVAL - Invalid segment usage number
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Invalid segment usage number
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOENT - Given segment usage is in hole block (may be returned if
+ * @create is zero)
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
int create, size_t *ndone,
@@ -258,10 +270,7 @@ int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
* @start: minimum segment number of allocatable region (inclusive)
* @end: maximum segment number of allocatable region (inclusive)
*
- * Return Value: On success, 0 is returned. On error, one of the
- * following negative error codes is returned.
- *
- * %-ERANGE - invalid segment region
+ * Return: 0 on success, or %-ERANGE if segment range is invalid.
*/
int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
{
@@ -286,17 +295,14 @@ int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end)
* @sufile: inode of segment usage file
* @segnump: pointer to segment number
*
- * Description: nilfs_sufile_alloc() allocates a clean segment.
+ * Description: nilfs_sufile_alloc() allocates a clean segment, and stores
+ * its segment number in the place pointed to by @segnump.
*
- * Return Value: On success, 0 is returned and the segment number of the
- * allocated segment is stored in the place pointed by @segnump. On error, one
- * of the following negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
- *
- * %-ENOSPC - No clean segment left.
+ * 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.
+ * * %-ENOSPC - No clean segment left.
*/
int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
{
@@ -306,6 +312,7 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
__u64 segnum, maxsegnum, last_alloc;
+ size_t offset;
void *kaddr;
unsigned long nsegments, nsus, cnt;
int ret, j;
@@ -315,10 +322,9 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_sem;
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
last_alloc = le64_to_cpu(header->sh_last_alloc);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
nsegments = nilfs_sufile_get_nsegments(sufile);
maxsegnum = sui->allocmax;
@@ -352,9 +358,10 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
&su_bh);
if (ret < 0)
goto out_header;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(
- sufile, segnum, su_bh, kaddr);
+
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum,
+ su_bh);
+ su = kaddr = kmap_local_folio(su_bh->b_folio, offset);
nsus = nilfs_sufile_segment_usages_in_block(
sufile, segnum, maxsegnum);
@@ -363,14 +370,13 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
continue;
/* found a clean segment */
nilfs_segment_usage_set_dirty(su);
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
le64_add_cpu(&header->sh_ncleansegs, -1);
le64_add_cpu(&header->sh_ndirtysegs, 1);
header->sh_last_alloc = cpu_to_le64(segnum);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
sui->ncleansegs--;
mark_buffer_dirty(header_bh);
@@ -384,7 +390,7 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
goto out_header;
}
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
brelse(su_bh);
}
@@ -404,18 +410,18 @@ void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
struct buffer_head *su_bh)
{
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, su_bh);
+ su = kmap_local_folio(su_bh->b_folio, offset);
if (unlikely(!nilfs_segment_usage_clean(su))) {
nilfs_warn(sufile->i_sb, "%s: segment %llu must be clean",
__func__, (unsigned long long)segnum);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
return;
}
nilfs_segment_usage_set_dirty(su);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
nilfs_sufile_mod_counter(header_bh, -1, 1);
NILFS_SUI(sufile)->ncleansegs--;
@@ -429,14 +435,14 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
struct buffer_head *su_bh)
{
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
int clean, dirty;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, su_bh);
+ su = kmap_local_folio(su_bh->b_folio, offset);
if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) &&
su->su_nblocks == cpu_to_le32(0)) {
- kunmap_atomic(kaddr);
+ kunmap_local(su);
return;
}
clean = nilfs_segment_usage_clean(su);
@@ -446,7 +452,7 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
su->su_lastmod = cpu_to_le64(0);
su->su_nblocks = cpu_to_le32(0);
su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY));
- kunmap_atomic(kaddr);
+ kunmap_local(su);
nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
NILFS_SUI(sufile)->ncleansegs -= clean;
@@ -460,23 +466,28 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
struct buffer_head *su_bh)
{
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
int sudirty;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, su_bh);
+ su = kmap_local_folio(su_bh->b_folio, offset);
if (nilfs_segment_usage_clean(su)) {
nilfs_warn(sufile->i_sb, "%s: segment %llu is already clean",
__func__, (unsigned long long)segnum);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
return;
}
- WARN_ON(nilfs_segment_usage_error(su));
- WARN_ON(!nilfs_segment_usage_dirty(su));
+ if (unlikely(nilfs_segment_usage_error(su)))
+ nilfs_warn(sufile->i_sb, "free segment %llu marked in error",
+ (unsigned long long)segnum);
sudirty = nilfs_segment_usage_dirty(su);
+ if (unlikely(!sudirty))
+ nilfs_warn(sufile->i_sb, "free unallocated segment %llu",
+ (unsigned long long)segnum);
+
nilfs_segment_usage_set_clean(su);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
mark_buffer_dirty(su_bh);
nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
@@ -491,18 +502,58 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
* nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
* @sufile: inode of segment usage file
* @segnum: segment number
+ *
+ * Return: 0 on success, or a negative error code on failure.
*/
int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
{
struct buffer_head *bh;
+ size_t offset;
+ struct nilfs_segment_usage *su;
int ret;
+ down_write(&NILFS_MDT(sufile)->mi_sem);
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
- if (!ret) {
+ if (unlikely(ret)) {
+ if (ret == -ENOENT) {
+ nilfs_error(sufile->i_sb,
+ "segment usage for segment %llu is unreadable due to a hole block",
+ (unsigned long long)segnum);
+ ret = -EIO;
+ }
+ goto out_sem;
+ }
+
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, bh);
+ su = kmap_local_folio(bh->b_folio, offset);
+ if (unlikely(nilfs_segment_usage_error(su))) {
+ struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
+
+ kunmap_local(su);
+ brelse(bh);
+ if (nilfs_segment_is_active(nilfs, segnum)) {
+ nilfs_error(sufile->i_sb,
+ "active segment %llu is erroneous",
+ (unsigned long long)segnum);
+ } else {
+ /*
+ * Segments marked erroneous are never allocated by
+ * nilfs_sufile_alloc(); only active segments, ie,
+ * the segments indexed by ns_segnum or ns_nextnum,
+ * can be erroneous here.
+ */
+ WARN_ON_ONCE(1);
+ }
+ ret = -EIO;
+ } else {
+ nilfs_segment_usage_set_dirty(su);
+ kunmap_local(su);
mark_buffer_dirty(bh);
nilfs_mdt_mark_dirty(sufile);
brelse(bh);
}
+out_sem:
+ up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}
@@ -512,13 +563,15 @@ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
* @segnum: segment number
* @nblocks: number of live blocks in the segment
* @modtime: modification time (option)
+ *
+ * Return: 0 on success, or a negative error code on failure.
*/
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time64_t modtime)
{
struct buffer_head *bh;
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
int ret;
down_write(&NILFS_MDT(sufile)->mi_sem);
@@ -526,13 +579,18 @@ int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
if (ret < 0)
goto out_sem;
- kaddr = kmap_atomic(bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
- WARN_ON(nilfs_segment_usage_error(su));
- if (modtime)
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, bh);
+ su = kmap_local_folio(bh->b_folio, offset);
+ if (modtime) {
+ /*
+ * Check segusage error and set su_lastmod only when updating
+ * this entry with a valid timestamp, not for cancellation.
+ */
+ WARN_ON_ONCE(nilfs_segment_usage_error(su));
su->su_lastmod = cpu_to_le64(modtime);
+ }
su->su_nblocks = cpu_to_le32(nblocks);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
mark_buffer_dirty(bh);
nilfs_mdt_mark_dirty(sufile);
@@ -548,23 +606,19 @@ int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
* @sufile: inode of segment usage file
* @sustat: pointer to a structure of segment usage statistics
*
- * Description: nilfs_sufile_get_stat() returns information about segment
- * usage.
- *
- * Return Value: On success, 0 is returned, and segment usage information is
- * stored in the place pointed by @sustat. On error, one of the following
- * negative error codes is returned.
+ * Description: nilfs_sufile_get_stat() retrieves segment usage statistics
+ * and stores them in the location pointed to by @sustat.
*
- * %-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_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
{
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
- void *kaddr;
int ret;
down_read(&NILFS_MDT(sufile)->mi_sem);
@@ -573,8 +627,7 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
if (ret < 0)
goto out_sem;
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile);
sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs);
sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs);
@@ -583,7 +636,7 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
spin_lock(&nilfs->ns_last_segment_lock);
sustat->ss_prot_seq = nilfs->ns_prot_seq;
spin_unlock(&nilfs->ns_last_segment_lock);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
brelse(header_bh);
out_sem:
@@ -596,18 +649,18 @@ void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
struct buffer_head *su_bh)
{
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
int suclean;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum, su_bh);
+ su = kmap_local_folio(su_bh->b_folio, offset);
if (nilfs_segment_usage_error(su)) {
- kunmap_atomic(kaddr);
+ kunmap_local(su);
return;
}
suclean = nilfs_segment_usage_clean(su);
nilfs_segment_usage_set_error(su);
- kunmap_atomic(kaddr);
+ kunmap_local(su);
if (suclean) {
nilfs_sufile_mod_counter(header_bh, -1, 0);
@@ -623,16 +676,12 @@ void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
* @start: start segment number (inclusive)
* @end: end segment number (inclusive)
*
- * 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 number of segments specified
- *
- * %-EBUSY - Dirty or active segments are present in the range
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EBUSY - Dirty or active segments are present in the range.
+ * * %-EINVAL - Invalid number of segments specified.
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
*/
static int nilfs_sufile_truncate_range(struct inode *sufile,
__u64 start, __u64 end)
@@ -645,7 +694,7 @@ static int nilfs_sufile_truncate_range(struct inode *sufile,
unsigned long segusages_per_block;
unsigned long nsegs, ncleaned;
__u64 segnum;
- void *kaddr;
+ size_t offset;
ssize_t n, nc;
int ret;
int j;
@@ -676,16 +725,16 @@ static int nilfs_sufile_truncate_range(struct inode *sufile,
/* hole */
continue;
}
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(
- sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum,
+ su_bh);
+ su = kmap_local_folio(su_bh->b_folio, offset);
su2 = su;
for (j = 0; j < n; j++, su = (void *)su + susz) {
if ((le32_to_cpu(su->su_flags) &
~BIT(NILFS_SEGMENT_USAGE_ERROR)) ||
nilfs_segment_is_active(nilfs, segnum + j)) {
ret = -EBUSY;
- kunmap_atomic(kaddr);
+ kunmap_local(su2);
brelse(su_bh);
goto out_header;
}
@@ -697,7 +746,7 @@ static int nilfs_sufile_truncate_range(struct inode *sufile,
nc++;
}
}
- kunmap_atomic(kaddr);
+ kunmap_local(su2);
if (nc > 0) {
mark_buffer_dirty(su_bh);
ncleaned += nc;
@@ -727,16 +776,12 @@ out:
* @sufile: inode of segment usage file
* @newnsegs: new number of segments
*
- * 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.
- *
- * %-ENOSPC - Enough free space is not left for shrinking
- *
- * %-EBUSY - Dirty or active segments exist in the region to be truncated
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EBUSY - Dirty or active segments exist in the region to be truncated.
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
+ * * %-ENOSPC - Enough free space is not left for shrinking.
*/
int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
{
@@ -744,7 +789,6 @@ int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
- void *kaddr;
unsigned long nsegs, nrsvsegs;
int ret = 0;
@@ -771,12 +815,20 @@ int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs)
goto out_header;
sui->ncleansegs -= nsegs - newnsegs;
+
+ /*
+ * If the sufile is successfully truncated, immediately adjust
+ * the segment allocation space while locking the semaphore
+ * "mi_sem" so that nilfs_sufile_alloc() never allocates
+ * segments in the truncated space.
+ */
+ sui->allocmax = newnsegs - 1;
+ sui->allocmin = 0;
}
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(sufile);
@@ -790,21 +842,17 @@ out:
}
/**
- * nilfs_sufile_get_suinfo -
+ * nilfs_sufile_get_suinfo - get segment usage information
* @sufile: inode of segment usage file
* @segnum: segment number to start looking
- * @buf: array of suinfo
- * @sisz: byte size of suinfo
- * @nsi: size of suinfo array
+ * @buf: array of suinfo
+ * @sisz: byte size of suinfo
+ * @nsi: size of suinfo array
*
- * Description:
- *
- * Return Value: On success, 0 is returned and .... On error, one of the
- * following negative error codes is returned.
- *
- * %-EIO - I/O error.
- *
- * %-ENOMEM - Insufficient amount of memory available.
+ * Return: Count of segment usage info items stored in the output buffer on
+ * success, or one of the following negative error codes on failure:
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
*/
ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
unsigned int sisz, size_t nsi)
@@ -814,6 +862,7 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
struct nilfs_suinfo *si = buf;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
+ size_t offset;
void *kaddr;
unsigned long nsegs, segusages_per_block;
ssize_t n;
@@ -841,9 +890,9 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
continue;
}
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(
- sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum,
+ su_bh);
+ su = kaddr = kmap_local_folio(su_bh->b_folio, offset);
for (j = 0; j < n;
j++, su = (void *)su + susz, si = (void *)si + sisz) {
si->sui_lastmod = le64_to_cpu(su->su_lastmod);
@@ -854,7 +903,7 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
si->sui_flags |=
BIT(NILFS_SEGMENT_USAGE_ACTIVE);
}
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
brelse(su_bh);
}
ret = nsegs;
@@ -875,14 +924,11 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
* segment usage accordingly. Only the fields indicated by the sup_flags
* are updated.
*
- * 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 values in input (segment number, flags or nblocks)
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Invalid values in input (segment number, flags or nblocks).
+ * * %-EIO - I/O error (including metadata corruption).
+ * * %-ENOMEM - Insufficient memory available.
*/
ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
unsigned int supsz, size_t nsup)
@@ -891,7 +937,7 @@ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
struct buffer_head *header_bh, *bh;
struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup;
struct nilfs_segment_usage *su;
- void *kaddr;
+ size_t offset;
unsigned long blkoff, prev_blkoff;
int cleansi, cleansu, dirtysi, dirtysu;
long ncleaned = 0, ndirtied = 0;
@@ -923,9 +969,9 @@ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
goto out_header;
for (;;) {
- kaddr = kmap_atomic(bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(
- sufile, sup->sup_segnum, bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(
+ sufile, sup->sup_segnum, bh);
+ su = kmap_local_folio(bh->b_folio, offset);
if (nilfs_suinfo_update_lastmod(sup))
su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod);
@@ -960,7 +1006,7 @@ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags);
}
- kunmap_atomic(kaddr);
+ kunmap_local(su);
sup = (void *)sup + supsz;
if (sup >= supend)
@@ -1009,13 +1055,14 @@ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf,
* and start+len is rounded down. For each clean segment blkdev_issue_discard
* function is invoked.
*
- * Return Value: On success, 0 is returned or negative error code, otherwise.
+ * Return: 0 on success, or a negative error code on failure.
*/
int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
{
struct the_nilfs *nilfs = sufile->i_sb->s_fs_info;
struct buffer_head *su_bh;
struct nilfs_segment_usage *su;
+ size_t offset;
void *kaddr;
size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size;
sector_t seg_start, seg_end, start_block, end_block;
@@ -1065,9 +1112,9 @@ int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
continue;
}
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(sufile, segnum,
- su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(sufile, segnum,
+ su_bh);
+ su = kaddr = kmap_local_folio(su_bh->b_folio, offset);
for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) {
if (!nilfs_segment_usage_clean(su))
continue;
@@ -1095,28 +1142,29 @@ int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
}
if (nblocks >= minlen) {
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
ret = blkdev_issue_discard(nilfs->ns_bdev,
start * sects_per_block,
nblocks * sects_per_block,
- GFP_NOFS, 0);
+ GFP_NOFS);
if (ret < 0) {
put_bh(su_bh);
goto out_sem;
}
ndiscarded += nblocks;
- kaddr = kmap_atomic(su_bh->b_page);
- su = nilfs_sufile_block_get_segment_usage(
- sufile, segnum, su_bh, kaddr);
+ offset = nilfs_sufile_segment_usage_offset(
+ sufile, segnum, su_bh);
+ su = kaddr = kmap_local_folio(su_bh->b_folio,
+ offset);
}
/* start new extent */
start = seg_start;
nblocks = seg_end - seg_start + 1;
}
- kunmap_atomic(kaddr);
+ kunmap_local(kaddr);
put_bh(su_bh);
}
@@ -1134,7 +1182,7 @@ int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range)
ret = blkdev_issue_discard(nilfs->ns_bdev,
start * sects_per_block,
nblocks * sects_per_block,
- GFP_NOFS, 0);
+ GFP_NOFS);
if (!ret)
ndiscarded += nblocks;
}
@@ -1153,6 +1201,8 @@ out_sem:
* @susize: size of a segment usage entry
* @raw_inode: on-disk sufile inode
* @inodep: buffer to store the inode
+ *
+ * Return: 0 on success, or a negative error code on failure.
*/
int nilfs_sufile_read(struct super_block *sb, size_t susize,
struct nilfs_inode *raw_inode, struct inode **inodep)
@@ -1161,7 +1211,6 @@ int nilfs_sufile_read(struct super_block *sb, size_t susize,
struct nilfs_sufile_info *sui;
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
- void *kaddr;
int err;
if (susize > sb->s_blocksize) {
@@ -1177,7 +1226,7 @@ int nilfs_sufile_read(struct super_block *sb, size_t susize,
sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
if (unlikely(!sufile))
return -ENOMEM;
- if (!(sufile->i_state & I_NEW))
+ if (!(inode_state_read_once(sufile) & I_NEW))
goto out;
err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui));
@@ -1191,15 +1240,20 @@ int nilfs_sufile_read(struct super_block *sb, size_t susize,
if (err)
goto failed;
- err = nilfs_sufile_get_header_block(sufile, &header_bh);
- if (err)
+ err = nilfs_mdt_get_block(sufile, 0, 0, NULL, &header_bh);
+ if (unlikely(err)) {
+ if (err == -ENOENT) {
+ nilfs_err(sb,
+ "missing header block in segment usage metadata");
+ err = -EINVAL;
+ }
goto failed;
+ }
sui = NILFS_SUI(sufile);
- kaddr = kmap_atomic(header_bh->b_page);
- header = kaddr + bh_offset(header_bh);
+ header = kmap_local_folio(header_bh->b_folio, 0);
sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
- kunmap_atomic(kaddr);
+ kunmap_local(header);
brelse(header_bh);
sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1;
generated by cgit (git 2.34.1) at 2025-12-25 22:23:17 +0000