* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Koji Sato <koji@osrg.net>.
+ * Rivised by Ryusuke Konishi <ryusuke@osrg.net>.
*/
#include <linux/kernel.h>
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);
+}
+
+/**
+ * nilfs_sufile_updatev - modify multiple segment usages at a time
+ * @sufile: inode of segment usage file
+ * @segnumv: array of segment numbers
+ * @nsegs: size of @segnumv array
+ * @create: creation flag
+ * @ndone: place to store number of modified segments on @segnumv
+ * @dofunc: primitive operation for the update
+ *
+ * Description: nilfs_sufile_updatev() repeatedly calls @dofunc
+ * against the given array of segments. The @dofunc is called with
+ * buffers of a header block and the sufile block in which the target
+ * segment usage entry is contained. If @ndone is given, the number
+ * 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
+ */
+int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs,
+ int create, size_t *ndone,
+ void (*dofunc)(struct inode *, __u64,
+ struct buffer_head *,
+ struct buffer_head *))
+{
+ struct buffer_head *header_bh, *bh;
+ unsigned long blkoff, prev_blkoff;
+ __u64 *seg;
+ size_t nerr = 0, n = 0;
+ int ret = 0;
+
+ if (unlikely(nsegs == 0))
+ goto out;
+
+ down_write(&NILFS_MDT(sufile)->mi_sem);
+ for (seg = segnumv; seg < segnumv + nsegs; seg++) {
+ if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) {
+ printk(KERN_WARNING
+ "%s: invalid segment number: %llu\n", __func__,
+ (unsigned long long)*seg);
+ nerr++;
+ }
+ }
+ if (nerr > 0) {
+ ret = -EINVAL;
+ goto out_sem;
+ }
+
+ ret = nilfs_sufile_get_header_block(sufile, &header_bh);
+ if (ret < 0)
+ goto out_sem;
+
+ seg = segnumv;
+ blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
+ ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
+ if (ret < 0)
+ goto out_header;
+
+ for (;;) {
+ dofunc(sufile, *seg, header_bh, bh);
+
+ if (++seg >= segnumv + nsegs)
+ break;
+ prev_blkoff = blkoff;
+ blkoff = nilfs_sufile_get_blkoff(sufile, *seg);
+ if (blkoff == prev_blkoff)
+ continue;
+
+ /* get different block */
+ brelse(bh);
+ ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh);
+ if (unlikely(ret < 0))
+ goto out_header;
+ }
+ brelse(bh);
+
+ out_header:
+ n = seg - segnumv;
+ brelse(header_bh);
+ out_sem:
+ up_write(&NILFS_MDT(sufile)->mi_sem);
+ out:
+ if (ndone)
+ *ndone = n;
+ return ret;
+}
+
+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
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;
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;
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_scrap(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;
-
- down_write(&NILFS_MDT(sufile)->mi_sem);
-
- nilfs = NILFS_MDT(sufile)->mi_nilfs;
+ int clean, dirty;
- /* 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 (su->su_flags == cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY) &&
+ su->su_nblocks == cpu_to_le32(0)) {
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);
+ clean = nilfs_segment_usage_clean(su);
+ dirty = nilfs_segment_usage_dirty(su);
+
+ /* make the segment garbage */
+ su->su_lastmod = cpu_to_le64(0);
+ su->su_nblocks = cpu_to_le32(0);
+ su->su_flags = cpu_to_le32(1UL << NILFS_SEGMENT_USAGE_DIRTY);
kunmap_atomic(kaddr, KM_USER0);
- nilfs_mdt_mark_buffer_dirty(header_bh);
+
+ nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
+ nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
+}
- out_bh:
- for (i--; i >= 0; i--)
- brelse(su_bh[i]);
- brelse(header_bh);
+void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
+ struct buffer_head *header_bh,
+ struct buffer_head *su_bh)
+{
+ struct nilfs_segment_usage *su;
+ void *kaddr;
+ int sudirty;
- out_su_bh:
- if (su_bh != su_bh_prealloc)
- kfree(su_bh);
+ 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);
+ return;
+ }
+ WARN_ON(nilfs_segment_usage_error(su));
+ WARN_ON(!nilfs_segment_usage_dirty(su));
- 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);
}
/**
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;
}
/**
* nilfs_sufile_get_suinfo -
* @sufile: inode of segment usage file
* @segnum: segment number to start looking
- * @si: array of suinfo
+ * @buf: array of suinfo
+ * @sisz: byte size of suinfo
* @nsi: size of suinfo array
*
* Description:
*
* %-ENOMEM - Insufficient amount of memory available.
*/
-ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum,
- struct nilfs_suinfo *si, size_t nsi)
+ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
+ unsigned sisz, size_t nsi)
{
struct buffer_head *su_bh;
struct nilfs_segment_usage *su;
+ struct nilfs_suinfo *si = buf;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
void *kaddr;
if (ret != -ENOENT)
goto out;
/* hole */
- memset(&si[i], 0, sizeof(struct nilfs_suinfo) * n);
+ memset(si, 0, sisz * n);
+ si = (void *)si + sisz * n;
continue;
}
kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(
sufile, segnum, su_bh, kaddr);
- for (j = 0; j < n; j++, su = (void *)su + susz) {
- si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod);
- si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks);
- si[i + j].sui_flags = le32_to_cpu(su->su_flags) &
+ for (j = 0; j < n;
+ j++, su = (void *)su + susz, si = (void *)si + sisz) {
+ si->sui_lastmod = le64_to_cpu(su->su_lastmod);
+ si->sui_nblocks = le32_to_cpu(su->su_nblocks);
+ si->sui_flags = le32_to_cpu(su->su_flags) &
~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
if (nilfs_segment_is_active(nilfs, segnum + j))
- si[i + j].sui_flags |=
+ si->sui_flags |=
(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
}
kunmap_atomic(kaddr, KM_USER0);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff