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4e7a4b0122
Currently when 'range->start' is beyond the end of file system nothing is done and that fact is ignored, where in fact we should return EINVAL. The same problem is when 'range.len' is smaller than file system block. Fix this by adding check for such conditions and return EINVAL appropriately. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Acked-by: Tino Reichardt <milky-kernel@mcmilk.de> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/*
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* Copyright (C) Tino Reichardt, 2012
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.h"
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#include "jfs_discard.h"
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#include "jfs_dmap.h"
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#include "jfs_debug.h"
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/*
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* NAME: jfs_issue_discard()
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*
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* FUNCTION: TRIM the specified block range on device, if supported
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*
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* PARAMETERS:
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* ip - pointer to in-core inode
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* blkno - starting block number to be trimmed (0..N)
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* nblocks - number of blocks to be trimmed
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*
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* RETURN VALUES:
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* none
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*
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* serialization: IREAD_LOCK(ipbmap) held on entry/exit;
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*/
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void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
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{
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struct super_block *sb = ip->i_sb;
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int r = 0;
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r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
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if (unlikely(r != 0)) {
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jfs_err("JFS: sb_issue_discard" \
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"(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!\n",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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}
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jfs_info("JFS: sb_issue_discard" \
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"(%p, %llu, %llu, GFP_NOFS, 0) = %d\n",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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return;
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}
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/*
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* NAME: jfs_ioc_trim()
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*
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* FUNCTION: attempt to discard (TRIM) all free blocks from the
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* filesystem.
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*
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* PARAMETERS:
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* ip - pointer to in-core inode;
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* range - the range, given by user space
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*
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* RETURN VALUES:
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* 0 - success
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* -EIO - i/o error
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*/
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int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
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{
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struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
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struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
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struct super_block *sb = ipbmap->i_sb;
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int agno, agno_end;
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u64 start, end, minlen;
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u64 trimmed = 0;
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/**
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* convert byte values to block size of filesystem:
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* start: First Byte to trim
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* len: number of Bytes to trim from start
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* minlen: minimum extent length in Bytes
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*/
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start = range->start >> sb->s_blocksize_bits;
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end = start + (range->len >> sb->s_blocksize_bits) - 1;
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minlen = range->minlen >> sb->s_blocksize_bits;
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if (minlen == 0)
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minlen = 1;
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if (minlen > bmp->db_agsize ||
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start >= bmp->db_mapsize ||
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range->len < sb->s_blocksize)
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return -EINVAL;
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if (end >= bmp->db_mapsize)
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end = bmp->db_mapsize - 1;
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/**
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* we trim all ag's within the range
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*/
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agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
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agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
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while (agno <= agno_end) {
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trimmed += dbDiscardAG(ip, agno, minlen);
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agno++;
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}
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range->len = trimmed << sb->s_blocksize_bits;
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return 0;
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}
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