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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /fs/jfs/jfs_discard.c | |
parent | Initial commit. (diff) | |
download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/jfs/jfs_discard.c')
-rw-r--r-- | fs/jfs/jfs_discard.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/fs/jfs/jfs_discard.c b/fs/jfs/jfs_discard.c new file mode 100644 index 000000000..f76ff0a46 --- /dev/null +++ b/fs/jfs/jfs_discard.c @@ -0,0 +1,119 @@ +/* + * Copyright (C) Tino Reichardt, 2012 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/blkdev.h> + +#include "jfs_incore.h" +#include "jfs_superblock.h" +#include "jfs_discard.h" +#include "jfs_dmap.h" +#include "jfs_debug.h" + + +/* + * NAME: jfs_issue_discard() + * + * FUNCTION: TRIM the specified block range on device, if supported + * + * PARAMETERS: + * ip - pointer to in-core inode + * blkno - starting block number to be trimmed (0..N) + * nblocks - number of blocks to be trimmed + * + * RETURN VALUES: + * none + * + * serialization: IREAD_LOCK(ipbmap) held on entry/exit; + */ +void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks) +{ + struct super_block *sb = ip->i_sb; + int r = 0; + + r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0); + if (unlikely(r != 0)) { + jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!", + sb, (unsigned long long)blkno, + (unsigned long long)nblocks, r); + } + + jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d", + sb, (unsigned long long)blkno, + (unsigned long long)nblocks, r); + + return; +} + +/* + * NAME: jfs_ioc_trim() + * + * FUNCTION: attempt to discard (TRIM) all free blocks from the + * filesystem. + * + * PARAMETERS: + * ip - pointer to in-core inode; + * range - the range, given by user space + * + * RETURN VALUES: + * 0 - success + * -EIO - i/o error + */ +int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range) +{ + struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; + struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap; + struct super_block *sb = ipbmap->i_sb; + int agno, agno_end; + u64 start, end, minlen; + u64 trimmed = 0; + + /** + * convert byte values to block size of filesystem: + * start: First Byte to trim + * len: number of Bytes to trim from start + * minlen: minimum extent length in Bytes + */ + start = range->start >> sb->s_blocksize_bits; + end = start + (range->len >> sb->s_blocksize_bits) - 1; + minlen = range->minlen >> sb->s_blocksize_bits; + if (minlen == 0) + minlen = 1; + + if (minlen > bmp->db_agsize || + start >= bmp->db_mapsize || + range->len < sb->s_blocksize) + return -EINVAL; + + if (end >= bmp->db_mapsize) + end = bmp->db_mapsize - 1; + + /** + * we trim all ag's within the range + */ + agno = BLKTOAG(start, JFS_SBI(ip->i_sb)); + agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb)); + while (agno <= agno_end) { + trimmed += dbDiscardAG(ip, agno, minlen); + agno++; + } + range->len = trimmed << sb->s_blocksize_bits; + + return 0; +} |