diff options
| -rw-r--r-- | fs/gfs2/bmap.c | 122 | ||||
| -rw-r--r-- | fs/gfs2/bmap.h | 1 | ||||
| -rw-r--r-- | fs/gfs2/file.c | 19 |
3 files changed, 134 insertions, 8 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index f6dbd2f400cc..2ec11981e694 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -1351,7 +1351,7 @@ static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length) u64 lblock = (offset + (1 << bsize_shift) - 1) >> bsize_shift; __u16 start_list[GFS2_MAX_META_HEIGHT]; __u16 __end_list[GFS2_MAX_META_HEIGHT], *end_list = NULL; - unsigned int start_aligned, end_aligned; + unsigned int start_aligned, uninitialized_var(end_aligned); unsigned int strip_h = ip->i_height - 1; u32 btotal = 0; int ret, state; @@ -1956,3 +1956,123 @@ int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, return 0; } +static int stuffed_zero_range(struct inode *inode, loff_t offset, loff_t length) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct buffer_head *dibh; + int error; + + if (offset >= inode->i_size) + return 0; + if (offset + length > inode->i_size) + length = inode->i_size - offset; + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + return error; + gfs2_trans_add_meta(ip->i_gl, dibh); + memset(dibh->b_data + sizeof(struct gfs2_dinode) + offset, 0, + length); + brelse(dibh); + return 0; +} + +static int gfs2_journaled_truncate_range(struct inode *inode, loff_t offset, + loff_t length) +{ + struct gfs2_sbd *sdp = GFS2_SB(inode); + loff_t max_chunk = GFS2_JTRUNC_REVOKES * sdp->sd_vfs->s_blocksize; + int error; + + while (length) { + struct gfs2_trans *tr; + loff_t chunk; + unsigned int offs; + + chunk = length; + if (chunk > max_chunk) + chunk = max_chunk; + + offs = offset & ~PAGE_MASK; + if (offs && chunk > PAGE_SIZE) + chunk = offs + ((chunk - offs) & PAGE_MASK); + + truncate_pagecache_range(inode, offset, chunk); + offset += chunk; + length -= chunk; + + tr = current->journal_info; + if (!test_bit(TR_TOUCHED, &tr->tr_flags)) + continue; + + gfs2_trans_end(sdp); + error = gfs2_trans_begin(sdp, RES_DINODE, GFS2_JTRUNC_REVOKES); + if (error) + return error; + } + return 0; +} + +int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length) +{ + struct inode *inode = file_inode(file); + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_sbd *sdp = GFS2_SB(inode); + int error; + + if (gfs2_is_jdata(ip)) + error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_JDATA, + GFS2_JTRUNC_REVOKES); + else + error = gfs2_trans_begin(sdp, RES_DINODE, 0); + if (error) + return error; + + if (gfs2_is_stuffed(ip)) { + error = stuffed_zero_range(inode, offset, length); + if (error) + goto out; + } else { + unsigned int start_off, end_off, blocksize; + + blocksize = i_blocksize(inode); + start_off = offset & (blocksize - 1); + end_off = (offset + length) & (blocksize - 1); + if (start_off) { + unsigned int len = length; + if (length > blocksize - start_off) + len = blocksize - start_off; + error = gfs2_block_zero_range(inode, offset, len); + if (error) + goto out; + if (start_off + length < blocksize) + end_off = 0; + } + if (end_off) { + error = gfs2_block_zero_range(inode, + offset + length - end_off, end_off); + if (error) + goto out; + } + } + + if (gfs2_is_jdata(ip)) { + BUG_ON(!current->journal_info); + gfs2_journaled_truncate_range(inode, offset, length); + } else + truncate_pagecache_range(inode, offset, offset + length - 1); + + file_update_time(file); + mark_inode_dirty(inode); + + if (current->journal_info) + gfs2_trans_end(sdp); + + if (!gfs2_is_stuffed(ip)) + error = punch_hole(ip, offset, length); + +out: + if (current->journal_info) + gfs2_trans_end(sdp); + return error; +} diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h index 443cc182cf18..c3402fe00653 100644 --- a/fs/gfs2/bmap.h +++ b/fs/gfs2/bmap.h @@ -61,5 +61,6 @@ extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, unsigned int len); extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd); extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd); +extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length); #endif /* __BMAP_DOT_H__ */ diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 58705ef8643a..bd60dc682676 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -924,7 +924,7 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t le struct gfs2_holder gh; int ret; - if (mode & ~FALLOC_FL_KEEP_SIZE) + if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)) return -EOPNOTSUPP; /* fallocate is needed by gfs2_grow to reserve space in the rindex */ if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex) @@ -948,13 +948,18 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t le if (ret) goto out_unlock; - ret = gfs2_rsqa_alloc(ip); - if (ret) - goto out_putw; + if (mode & FALLOC_FL_PUNCH_HOLE) { + ret = __gfs2_punch_hole(file, offset, len); + } else { + ret = gfs2_rsqa_alloc(ip); + if (ret) + goto out_putw; - ret = __gfs2_fallocate(file, mode, offset, len); - if (ret) - gfs2_rs_deltree(&ip->i_res); + ret = __gfs2_fallocate(file, mode, offset, len); + + if (ret) + gfs2_rs_deltree(&ip->i_res); + } out_putw: put_write_access(inode); |