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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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nilfs2: convert checkpoint file to be folio-based
Regarding the cpfile, a metadata file that manages checkpoints, convert the page-based implementation to a folio-based implementation. This change involves some helper functions to calculate byte offsets on folios and removing a few helper functions that are no longer needed. Link: https://lkml.kernel.org/r/20241024092602.13395-9-konishi.ryusuke@gmail.com Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryusuke Konishi
Andrew Morton
parent
cdee17960f
commit
a6cb5b1e9c
@ -68,49 +68,36 @@ static inline int nilfs_cpfile_is_in_first(const struct inode *cpfile,
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static unsigned int
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nilfs_cpfile_block_add_valid_checkpoints(const struct inode *cpfile,
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struct buffer_head *bh,
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void *kaddr,
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unsigned int n)
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{
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struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
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struct nilfs_checkpoint *cp;
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unsigned int count;
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cp = kmap_local_folio(bh->b_folio,
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offset_in_folio(bh->b_folio, bh->b_data));
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count = le32_to_cpu(cp->cp_checkpoints_count) + n;
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cp->cp_checkpoints_count = cpu_to_le32(count);
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kunmap_local(cp);
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return count;
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}
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static unsigned int
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nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
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struct buffer_head *bh,
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void *kaddr,
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unsigned int n)
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{
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struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
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struct nilfs_checkpoint *cp;
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unsigned int count;
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cp = kmap_local_folio(bh->b_folio,
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offset_in_folio(bh->b_folio, bh->b_data));
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WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
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count = le32_to_cpu(cp->cp_checkpoints_count) - n;
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cp->cp_checkpoints_count = cpu_to_le32(count);
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kunmap_local(cp);
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return count;
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}
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static inline struct nilfs_cpfile_header *
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nilfs_cpfile_block_get_header(const struct inode *cpfile,
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struct buffer_head *bh,
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void *kaddr)
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{
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return kaddr + bh_offset(bh);
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}
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static struct nilfs_checkpoint *
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nilfs_cpfile_block_get_checkpoint(const struct inode *cpfile, __u64 cno,
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struct buffer_head *bh,
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void *kaddr)
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{
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return kaddr + bh_offset(bh) + nilfs_cpfile_get_offset(cpfile, cno) *
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NILFS_MDT(cpfile)->mi_entry_size;
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}
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static void nilfs_cpfile_block_init(struct inode *cpfile,
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struct buffer_head *bh,
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void *from)
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@ -125,6 +112,54 @@ static void nilfs_cpfile_block_init(struct inode *cpfile,
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}
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}
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/**
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* nilfs_cpfile_checkpoint_offset - calculate the byte offset of a checkpoint
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* entry in the folio containing it
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* @cpfile: checkpoint file inode
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* @cno: checkpoint number
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* @bh: buffer head of block containing checkpoint indexed by @cno
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*
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* Return: Byte offset in the folio of the checkpoint specified by @cno.
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*/
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static size_t nilfs_cpfile_checkpoint_offset(const struct inode *cpfile,
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__u64 cno,
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struct buffer_head *bh)
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{
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return offset_in_folio(bh->b_folio, bh->b_data) +
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nilfs_cpfile_get_offset(cpfile, cno) *
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NILFS_MDT(cpfile)->mi_entry_size;
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}
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/**
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* nilfs_cpfile_cp_snapshot_list_offset - calculate the byte offset of a
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* checkpoint snapshot list in the folio
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* containing it
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* @cpfile: checkpoint file inode
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* @cno: checkpoint number
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* @bh: buffer head of block containing checkpoint indexed by @cno
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*
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* Return: Byte offset in the folio of the checkpoint snapshot list specified
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* by @cno.
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*/
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static size_t nilfs_cpfile_cp_snapshot_list_offset(const struct inode *cpfile,
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__u64 cno,
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struct buffer_head *bh)
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{
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return nilfs_cpfile_checkpoint_offset(cpfile, cno, bh) +
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offsetof(struct nilfs_checkpoint, cp_snapshot_list);
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}
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/**
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* nilfs_cpfile_ch_snapshot_list_offset - calculate the byte offset of the
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* snapshot list in the header
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*
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* Return: Byte offset in the folio of the checkpoint snapshot list
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*/
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static size_t nilfs_cpfile_ch_snapshot_list_offset(void)
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{
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return offsetof(struct nilfs_cpfile_header, ch_snapshot_list);
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}
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static int nilfs_cpfile_get_header_block(struct inode *cpfile,
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struct buffer_head **bhp)
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{
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@ -214,7 +249,7 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
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{
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struct buffer_head *cp_bh;
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struct nilfs_checkpoint *cp;
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void *kaddr;
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size_t offset;
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int ret;
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if (cno < 1 || cno > nilfs_mdt_cno(cpfile))
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@ -228,8 +263,8 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
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goto out_sem;
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}
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kaddr = kmap_local_page(cp_bh->b_page);
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
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cp = kmap_local_folio(cp_bh->b_folio, offset);
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if (nilfs_checkpoint_invalid(cp)) {
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ret = -EINVAL;
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goto put_cp;
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@ -254,7 +289,7 @@ int nilfs_cpfile_read_checkpoint(struct inode *cpfile, __u64 cno,
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root->ifile = ifile;
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put_cp:
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kunmap_local(kaddr);
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kunmap_local(cp);
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brelse(cp_bh);
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out_sem:
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up_read(&NILFS_MDT(cpfile)->mi_sem);
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@ -282,7 +317,7 @@ int nilfs_cpfile_create_checkpoint(struct inode *cpfile, __u64 cno)
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struct buffer_head *header_bh, *cp_bh;
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struct nilfs_cpfile_header *header;
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struct nilfs_checkpoint *cp;
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void *kaddr;
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size_t offset;
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int ret;
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if (WARN_ON_ONCE(cno < 1))
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@ -297,24 +332,22 @@ int nilfs_cpfile_create_checkpoint(struct inode *cpfile, __u64 cno)
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if (unlikely(ret < 0))
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goto out_header;
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kaddr = kmap_local_page(cp_bh->b_page);
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
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cp = kmap_local_folio(cp_bh->b_folio, offset);
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if (nilfs_checkpoint_invalid(cp)) {
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/* a newly-created checkpoint */
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nilfs_checkpoint_clear_invalid(cp);
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kunmap_local(cp);
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if (!nilfs_cpfile_is_in_first(cpfile, cno))
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nilfs_cpfile_block_add_valid_checkpoints(cpfile, cp_bh,
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kaddr, 1);
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kunmap_local(kaddr);
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1);
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kaddr = kmap_local_page(header_bh->b_page);
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header = nilfs_cpfile_block_get_header(cpfile, header_bh,
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kaddr);
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header = kmap_local_folio(header_bh->b_folio, 0);
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le64_add_cpu(&header->ch_ncheckpoints, 1);
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kunmap_local(kaddr);
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kunmap_local(header);
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mark_buffer_dirty(header_bh);
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} else {
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kunmap_local(kaddr);
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kunmap_local(cp);
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}
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/* Force the buffer and the inode to become dirty */
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@ -353,7 +386,7 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
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{
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struct buffer_head *cp_bh;
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struct nilfs_checkpoint *cp;
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void *kaddr;
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size_t offset;
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int ret;
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if (WARN_ON_ONCE(cno < 1))
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@ -367,10 +400,10 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
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goto out_sem;
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}
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kaddr = kmap_local_page(cp_bh->b_page);
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, cp_bh, kaddr);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
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cp = kmap_local_folio(cp_bh->b_folio, offset);
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if (unlikely(nilfs_checkpoint_invalid(cp))) {
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kunmap_local(kaddr);
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kunmap_local(cp);
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brelse(cp_bh);
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goto error;
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}
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@ -391,7 +424,7 @@ int nilfs_cpfile_finalize_checkpoint(struct inode *cpfile, __u64 cno,
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nilfs_write_inode_common(root->ifile, &cp->cp_ifile_inode);
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nilfs_bmap_write(NILFS_I(root->ifile)->i_bmap, &cp->cp_ifile_inode);
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kunmap_local(kaddr);
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kunmap_local(cp);
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brelse(cp_bh);
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out_sem:
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up_write(&NILFS_MDT(cpfile)->mi_sem);
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@ -432,6 +465,7 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
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struct nilfs_checkpoint *cp;
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size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
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__u64 cno;
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size_t offset;
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void *kaddr;
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unsigned long tnicps;
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int ret, ncps, nicps, nss, count, i;
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@ -462,9 +496,8 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
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continue;
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}
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kaddr = kmap_local_page(cp_bh->b_page);
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cp = nilfs_cpfile_block_get_checkpoint(
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cpfile, cno, cp_bh, kaddr);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, cp_bh);
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cp = kaddr = kmap_local_folio(cp_bh->b_folio, offset);
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nicps = 0;
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for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
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if (nilfs_checkpoint_snapshot(cp)) {
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@ -474,43 +507,42 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
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nicps++;
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}
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}
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if (nicps > 0) {
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tnicps += nicps;
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mark_buffer_dirty(cp_bh);
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nilfs_mdt_mark_dirty(cpfile);
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if (!nilfs_cpfile_is_in_first(cpfile, cno)) {
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count =
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nilfs_cpfile_block_sub_valid_checkpoints(
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cpfile, cp_bh, kaddr, nicps);
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if (count == 0) {
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/* make hole */
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kunmap_local(kaddr);
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brelse(cp_bh);
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ret =
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nilfs_cpfile_delete_checkpoint_block(
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cpfile, cno);
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if (ret == 0)
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continue;
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nilfs_err(cpfile->i_sb,
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"error %d deleting checkpoint block",
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ret);
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break;
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}
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}
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kunmap_local(kaddr);
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if (nicps <= 0) {
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brelse(cp_bh);
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continue;
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}
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kunmap_local(kaddr);
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tnicps += nicps;
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mark_buffer_dirty(cp_bh);
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nilfs_mdt_mark_dirty(cpfile);
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if (nilfs_cpfile_is_in_first(cpfile, cno)) {
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brelse(cp_bh);
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continue;
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}
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count = nilfs_cpfile_block_sub_valid_checkpoints(cpfile, cp_bh,
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nicps);
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brelse(cp_bh);
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if (count)
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continue;
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/* Delete the block if there are no more valid checkpoints */
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ret = nilfs_cpfile_delete_checkpoint_block(cpfile, cno);
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if (unlikely(ret)) {
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nilfs_err(cpfile->i_sb,
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"error %d deleting checkpoint block", ret);
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break;
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}
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}
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if (tnicps > 0) {
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kaddr = kmap_local_page(header_bh->b_page);
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header = nilfs_cpfile_block_get_header(cpfile, header_bh,
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kaddr);
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header = kmap_local_folio(header_bh->b_folio, 0);
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le64_add_cpu(&header->ch_ncheckpoints, -(u64)tnicps);
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mark_buffer_dirty(header_bh);
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nilfs_mdt_mark_dirty(cpfile);
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kunmap_local(kaddr);
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kunmap_local(header);
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}
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brelse(header_bh);
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@ -544,6 +576,7 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
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struct buffer_head *bh;
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size_t cpsz = NILFS_MDT(cpfile)->mi_entry_size;
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__u64 cur_cno = nilfs_mdt_cno(cpfile), cno = *cnop;
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size_t offset;
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void *kaddr;
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int n, ret;
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int ncps, i;
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@ -562,8 +595,8 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
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}
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ncps = nilfs_cpfile_checkpoints_in_block(cpfile, cno, cur_cno);
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kaddr = kmap_local_page(bh->b_page);
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, cno, bh);
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cp = kaddr = kmap_local_folio(bh->b_folio, offset);
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for (i = 0; i < ncps && n < nci; i++, cp = (void *)cp + cpsz) {
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if (!nilfs_checkpoint_invalid(cp)) {
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nilfs_cpfile_checkpoint_to_cpinfo(cpfile, cp,
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@ -597,7 +630,7 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
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struct nilfs_cpinfo *ci = buf;
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__u64 curr = *cnop, next;
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unsigned long curr_blkoff, next_blkoff;
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void *kaddr;
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size_t offset;
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int n = 0, ret;
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down_read(&NILFS_MDT(cpfile)->mi_sem);
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@ -606,10 +639,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
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ret = nilfs_cpfile_get_header_block(cpfile, &bh);
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if (ret < 0)
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goto out;
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kaddr = kmap_local_page(bh->b_page);
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header = nilfs_cpfile_block_get_header(cpfile, bh, kaddr);
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header = kmap_local_folio(bh->b_folio, 0);
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curr = le64_to_cpu(header->ch_snapshot_list.ssl_next);
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kunmap_local(kaddr);
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kunmap_local(header);
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brelse(bh);
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if (curr == 0) {
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ret = 0;
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@ -627,9 +659,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
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ret = 0; /* No snapshots (started from a hole block) */
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goto out;
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}
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kaddr = kmap_local_page(bh->b_page);
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offset = nilfs_cpfile_checkpoint_offset(cpfile, curr, bh);
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cp = kmap_local_folio(bh->b_folio, offset);
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while (n < nci) {
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, curr, bh, kaddr);
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curr = ~(__u64)0; /* Terminator */
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if (unlikely(nilfs_checkpoint_invalid(cp) ||
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!nilfs_checkpoint_snapshot(cp)))
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@ -641,9 +673,9 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
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if (next == 0)
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break; /* reach end of the snapshot list */
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kunmap_local(cp);
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next_blkoff = nilfs_cpfile_get_blkoff(cpfile, next);
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if (curr_blkoff != next_blkoff) {
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kunmap_local(kaddr);
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brelse(bh);
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ret = nilfs_cpfile_get_checkpoint_block(cpfile, next,
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0, &bh);
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@ -651,12 +683,13 @@ static ssize_t nilfs_cpfile_do_get_ssinfo(struct inode *cpfile, __u64 *cnop,
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WARN_ON(ret == -ENOENT);
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goto out;
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}
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kaddr = kmap_local_page(bh->b_page);
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}
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offset = nilfs_cpfile_checkpoint_offset(cpfile, next, bh);
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cp = kmap_local_folio(bh->b_folio, offset);
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curr = next;
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curr_blkoff = next_blkoff;
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}
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kunmap_local(kaddr);
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kunmap_local(cp);
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brelse(bh);
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*cnop = curr;
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ret = n;
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@ -733,26 +766,6 @@ int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
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return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
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}
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static struct nilfs_snapshot_list *
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nilfs_cpfile_block_get_snapshot_list(const struct inode *cpfile,
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__u64 cno,
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struct buffer_head *bh,
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void *kaddr)
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{
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struct nilfs_cpfile_header *header;
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struct nilfs_checkpoint *cp;
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struct nilfs_snapshot_list *list;
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if (cno != 0) {
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cp = nilfs_cpfile_block_get_checkpoint(cpfile, cno, bh, kaddr);
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list = &cp->cp_snapshot_list;
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||||
} 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;
|
||||
@ -761,94 +774,103 @@ 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);
|
||||
@ -861,12 +883,12 @@ 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;
|
||||
@ -879,79 +901,87 @@ 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);
|
||||
@ -964,12 +994,12 @@ 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;
|
||||
@ -990,7 +1020,7 @@ 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;
|
||||
|
||||
/*
|
||||
@ -1004,13 +1034,14 @@ 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:
|
||||
@ -1079,7 +1110,6 @@ 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);
|
||||
@ -1087,12 +1117,11 @@ 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:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user