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xfs: move symlink target write function to libxfs 

Move xfs_symlink_write_target to xfs_symlink_remote.c so that kernel and
mkfs can share the same function.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-02-22 12:48:20 -08:00
parent 376b4f0522
commit b8102b61f7
3 changed files with 84 additions and 64 deletions
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76
fs/xfs/libxfs/xfs_symlink_remote.c
View File

@ -304,3 +304,79 @@ xfs_symlink_remote_read(
out:
return error;
}
/* Write the symlink target into the inode. */
int
xfs_symlink_write_target(
struct xfs_trans *tp,
struct xfs_inode *ip,
const char *target_path,
int pathlen,
xfs_fsblock_t fs_blocks,
uint resblks)
{
struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
struct xfs_mount *mp = tp->t_mountp;
const char *cur_chunk;
struct xfs_buf *bp;
xfs_daddr_t d;
int byte_cnt;
int nmaps;
int offset = 0;
int n;
int error;
/*
* If the symlink will fit into the inode, write it inline.
*/
if (pathlen <= xfs_inode_data_fork_size(ip)) {
xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
ip->i_disk_size = pathlen;
ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
return 0;
}
nmaps = XFS_SYMLINK_MAPS;
error = xfs_bmapi_write(tp, ip, 0, fs_blocks, XFS_BMAPI_METADATA,
resblks, mval, &nmaps);
if (error)
return error;
ip->i_disk_size = pathlen;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
cur_chunk = target_path;
offset = 0;
for (n = 0; n < nmaps; n++) {
char *buf;
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
BTOBB(byte_cnt), 0, &bp);
if (error)
return error;
bp->b_ops = &xfs_symlink_buf_ops;
byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
byte_cnt = min(byte_cnt, pathlen);
buf = bp->b_addr;
buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset, byte_cnt,
bp);
memcpy(buf, cur_chunk, byte_cnt);
cur_chunk += byte_cnt;
pathlen -= byte_cnt;
offset += byte_cnt;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
(char *)bp->b_addr);
}
ASSERT(pathlen == 0);
return 0;
}

3
fs/xfs/libxfs/xfs_symlink_remote.h
View File

@ -19,5 +19,8 @@ void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
struct xfs_inode *ip, struct xfs_ifork *ifp);
xfs_failaddr_t xfs_symlink_shortform_verify(void *sfp, int64_t size);
int xfs_symlink_remote_read(struct xfs_inode *ip, char *link);
int xfs_symlink_write_target(struct xfs_trans *tp, struct xfs_inode *ip,
const char *target_path, int pathlen, xfs_fsblock_t fs_blocks,
uint resblks);
#endif /* __XFS_SYMLINK_REMOTE_H */

69
fs/xfs/xfs_symlink.c
View File

@ -93,15 +93,7 @@ xfs_symlink(
int error = 0;
int pathlen;
bool unlock_dp_on_error = false;
xfs_fileoff_t first_fsb;
xfs_filblks_t fs_blocks;
int nmaps;
struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
xfs_daddr_t d;
const char *cur_chunk;
int byte_cnt;
int n;
struct xfs_buf *bp;
prid_t prid;
struct xfs_dquot *udqp = NULL;
struct xfs_dquot *gdqp = NULL;
@ -189,62 +181,11 @@ xfs_symlink(
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
resblks -= XFS_IALLOC_SPACE_RES(mp);
/*
* If the symlink will fit into the inode, write it inline.
*/
if (pathlen <= xfs_inode_data_fork_size(ip)) {
xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
ip->i_disk_size = pathlen;
ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
} else {
int offset;
first_fsb = 0;
nmaps = XFS_SYMLINK_MAPS;
error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
XFS_BMAPI_METADATA, resblks, mval, &nmaps);
if (error)
goto out_trans_cancel;
resblks -= fs_blocks;
ip->i_disk_size = pathlen;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
cur_chunk = target_path;
offset = 0;
for (n = 0; n < nmaps; n++) {
char *buf;
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
BTOBB(byte_cnt), 0, &bp);
if (error)
goto out_trans_cancel;
bp->b_ops = &xfs_symlink_buf_ops;
byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
byte_cnt = min(byte_cnt, pathlen);
buf = bp->b_addr;
buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
byte_cnt, bp);
memcpy(buf, cur_chunk, byte_cnt);
cur_chunk += byte_cnt;
pathlen -= byte_cnt;
offset += byte_cnt;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
(char *)bp->b_addr);
}
ASSERT(pathlen == 0);
}
error = xfs_symlink_write_target(tp, ip, target_path, pathlen,
fs_blocks, resblks);
if (error)
goto out_trans_cancel;
resblks -= fs_blocks;
i_size_write(VFS_I(ip), ip->i_disk_size);
/*