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nilfs2: segment usage file cleanups
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This will simplify sufile.c by sharing common code which repeatedly
appears in routines updating a segment usage entry; a wrapper function
nilfs_sufile_update() is introduced for the purpose, and counter
modifications are integrated to a new function
nilfs_sufile_mod_counter().

This is a preparation for the successive bugfix patch ("nilfs2: fix
possible mismatch of sufile counters on recovery").

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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Ryusuke Konishi committed Apr 13, 2009
1 parent 88072fa commit a703018
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Showing 2 changed files with 140 additions and 195 deletions.
268 changes: 77 additions & 191 deletions fs/nilfs2/sufile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,52 @@ nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
create, NULL, bhp);
}

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, KM_USER0);
header = kaddr + bh_offset(header_bh);
le64_add_cpu(&header->sh_ncleansegs, ncleanadd);
le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd);
kunmap_atomic(kaddr, KM_USER0);

nilfs_mdt_mark_buffer_dirty(header_bh);
}

int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create,
void (*dofunc)(struct inode *, __u64,
struct buffer_head *,
struct buffer_head *))
{
struct buffer_head *header_bh, *bh;
int ret;

if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
printk(KERN_WARNING "%s: invalid segment number: %llu\n",
__func__, (unsigned long long)segnum);
return -EINVAL;
}
down_write(&NILFS_MDT(sufile)->mi_sem);

ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_sem;

ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh);
if (!ret) {
dofunc(sufile, segnum, header_bh, bh);
brelse(bh);
}
brelse(header_bh);

out_sem:
up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}

/**
* nilfs_sufile_alloc - allocate a segment
* @sufile: inode of segment usage file
Expand All @@ -113,7 +159,6 @@ nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum,
int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
{
struct buffer_head *header_bh, *su_bh;
struct the_nilfs *nilfs;
struct nilfs_sufile_header *header;
struct nilfs_segment_usage *su;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
Expand All @@ -124,8 +169,6 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)

down_write(&NILFS_MDT(sufile)->mi_sem);

nilfs = NILFS_MDT(sufile)->mi_nilfs;

ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_sem;
Expand Down Expand Up @@ -192,165 +235,55 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
return ret;
}

/**
* nilfs_sufile_cancel_free -
* @sufile: inode of segment usage file
* @segnum: segment number
*
* Description:
*
* 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.
*/
int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)
{
struct buffer_head *header_bh, *su_bh;
struct the_nilfs *nilfs;
struct nilfs_sufile_header *header;
struct nilfs_segment_usage *su;
void *kaddr;
int ret;

down_write(&NILFS_MDT(sufile)->mi_sem);

nilfs = NILFS_MDT(sufile)->mi_nilfs;

ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_sem;

ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh);
if (ret < 0)
goto out_header;

kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(
sufile, segnum, su_bh, kaddr);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
if (unlikely(!nilfs_segment_usage_clean(su))) {
printk(KERN_WARNING "%s: segment %llu must be clean\n",
__func__, (unsigned long long)segnum);
kunmap_atomic(kaddr, KM_USER0);
goto out_su_bh;
return;
}
nilfs_segment_usage_set_dirty(su);
kunmap_atomic(kaddr, KM_USER0);

kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
le64_add_cpu(&header->sh_ncleansegs, -1);
le64_add_cpu(&header->sh_ndirtysegs, 1);
kunmap_atomic(kaddr, KM_USER0);

nilfs_mdt_mark_buffer_dirty(header_bh);
nilfs_sufile_mod_counter(header_bh, -1, 1);
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);

out_su_bh:
brelse(su_bh);
out_header:
brelse(header_bh);
out_sem:
up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}

/**
* nilfs_sufile_freev - free segments
* @sufile: inode of segment usage file
* @segnum: array of segment numbers
* @nsegs: number of segments
*
* Description: nilfs_sufile_freev() frees segments specified by @segnum and
* @nsegs, which must have been returned by a previous call to
* nilfs_sufile_alloc().
*
* 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.
*/
#define NILFS_SUFILE_FREEV_PREALLOC 16
int nilfs_sufile_freev(struct inode *sufile, __u64 *segnum, size_t nsegs)
void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)
{
struct buffer_head *header_bh, **su_bh,
*su_bh_prealloc[NILFS_SUFILE_FREEV_PREALLOC];
struct the_nilfs *nilfs;
struct nilfs_sufile_header *header;
struct nilfs_segment_usage *su;
void *kaddr;
int ret, i;
int sudirty;

down_write(&NILFS_MDT(sufile)->mi_sem);

nilfs = NILFS_MDT(sufile)->mi_nilfs;

/* prepare resources */
if (nsegs <= NILFS_SUFILE_FREEV_PREALLOC)
su_bh = su_bh_prealloc;
else {
su_bh = kmalloc(sizeof(*su_bh) * nsegs, GFP_NOFS);
if (su_bh == NULL) {
ret = -ENOMEM;
goto out_sem;
}
}

ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_su_bh;
for (i = 0; i < nsegs; i++) {
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum[i],
0, &su_bh[i]);
if (ret < 0)
goto out_bh;
}

/* free segments */
for (i = 0; i < nsegs; i++) {
kaddr = kmap_atomic(su_bh[i]->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(
sufile, segnum[i], su_bh[i], kaddr);
WARN_ON(nilfs_segment_usage_error(su));
nilfs_segment_usage_set_clean(su);
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
if (nilfs_segment_usage_clean(su)) {
printk(KERN_WARNING "%s: segment %llu is already clean\n",
__func__, (unsigned long long)segnum);
kunmap_atomic(kaddr, KM_USER0);
nilfs_mdt_mark_buffer_dirty(su_bh[i]);
return;
}
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
le64_add_cpu(&header->sh_ncleansegs, nsegs);
le64_add_cpu(&header->sh_ndirtysegs, -(u64)nsegs);
kunmap_atomic(kaddr, KM_USER0);
nilfs_mdt_mark_buffer_dirty(header_bh);
nilfs_mdt_mark_dirty(sufile);

out_bh:
for (i--; i >= 0; i--)
brelse(su_bh[i]);
brelse(header_bh);
WARN_ON(nilfs_segment_usage_error(su));
WARN_ON(!nilfs_segment_usage_dirty(su));

out_su_bh:
if (su_bh != su_bh_prealloc)
kfree(su_bh);

out_sem:
up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}
sudirty = nilfs_segment_usage_dirty(su);
nilfs_segment_usage_set_clean(su);
kunmap_atomic(kaddr, KM_USER0);
nilfs_mdt_mark_buffer_dirty(su_bh);

/**
* nilfs_sufile_free -
* @sufile:
* @segnum:
*/
int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
{
return nilfs_sufile_freev(sufile, &segnum, 1);
nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
nilfs_mdt_mark_dirty(sufile);
}

/**
Expand Down Expand Up @@ -500,75 +433,28 @@ int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
return ret;
}

/**
* nilfs_sufile_set_error - mark a segment as erroneous
* @sufile: inode of segment usage file
* @segnum: segment number
*
* Description: nilfs_sufile_set_error() marks the segment specified by
* @segnum as erroneous. The error segment will never be used again.
*
* 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 segment usage number.
*/
int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
struct buffer_head *header_bh,
struct buffer_head *su_bh)
{
struct buffer_head *header_bh, *su_bh;
struct nilfs_segment_usage *su;
struct nilfs_sufile_header *header;
void *kaddr;
int suclean, ret;

if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
printk(KERN_WARNING "%s: invalid segment number: %llu\n",
__func__, (unsigned long long)segnum);
return -EINVAL;
}
down_write(&NILFS_MDT(sufile)->mi_sem);

ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (ret < 0)
goto out_sem;
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh);
if (ret < 0)
goto out_header;
int suclean;

kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr);
if (nilfs_segment_usage_error(su)) {
kunmap_atomic(kaddr, KM_USER0);
brelse(su_bh);
goto out_header;
return;
}
suclean = nilfs_segment_usage_clean(su);

nilfs_segment_usage_set_error(su);
kunmap_atomic(kaddr, KM_USER0);

if (suclean) {
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = nilfs_sufile_block_get_header(sufile, header_bh,
kaddr);
le64_add_cpu(&header->sh_ncleansegs, -1);
kunmap_atomic(kaddr, KM_USER0);
nilfs_mdt_mark_buffer_dirty(header_bh);
}
if (suclean)
nilfs_sufile_mod_counter(header_bh, -1, 0);
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
brelse(su_bh);

out_header:
brelse(header_bh);

out_sem:
up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}

/**
Expand Down
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