gfs2: gfs2_iomap_begin cleanup
Following commit d0a22a4b03 ("gfs2: Fix iomap write page reclaim deadlock"),
gfs2_iomap_begin and gfs2_iomap_begin_write can be further cleaned up and the
split between those two functions can be improved.
With suggestions from Christoph Hellwig.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
alistair/sunxi64-5.4-dsi
Andreas Gruenbacher
parent
a27a0c9b6a
commit
34aad20bc3
116
fs/gfs2/bmap.c
116
fs/gfs2/bmap.c
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@ -1065,54 +1065,38 @@ static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos,
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
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bool unstuff, alloc_required;
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bool unstuff;
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int ret;
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ret = gfs2_write_lock(inode);
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if (ret)
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return ret;
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unstuff = gfs2_is_stuffed(ip) &&
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pos + length > gfs2_max_stuffed_size(ip);
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ret = gfs2_iomap_get(inode, pos, length, flags, iomap, mp);
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if (ret)
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goto out_unlock;
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if (unstuff || iomap->type == IOMAP_HOLE) {
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unsigned int data_blocks, ind_blocks;
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struct gfs2_alloc_parms ap = {};
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unsigned int rblocks;
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struct gfs2_trans *tr;
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alloc_required = unstuff || iomap->type == IOMAP_HOLE;
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if (alloc_required || gfs2_is_jdata(ip))
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gfs2_write_calc_reserv(ip, iomap->length, &data_blocks,
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&ind_blocks);
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if (alloc_required) {
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struct gfs2_alloc_parms ap = {
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.target = data_blocks + ind_blocks
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};
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ap.target = data_blocks + ind_blocks;
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ret = gfs2_quota_lock_check(ip, &ap);
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if (ret)
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goto out_unlock;
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return ret;
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ret = gfs2_inplace_reserve(ip, &ap);
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if (ret)
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goto out_qunlock;
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}
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rblocks = RES_DINODE + ind_blocks;
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if (gfs2_is_jdata(ip))
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rblocks += data_blocks;
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if (ind_blocks || data_blocks)
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rblocks += RES_STATFS + RES_QUOTA;
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if (inode == sdp->sd_rindex)
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rblocks += 2 * RES_STATFS;
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if (alloc_required)
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rblocks = RES_DINODE + ind_blocks;
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if (gfs2_is_jdata(ip))
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rblocks += data_blocks;
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if (ind_blocks || data_blocks)
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rblocks += RES_STATFS + RES_QUOTA;
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if (inode == sdp->sd_rindex)
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rblocks += 2 * RES_STATFS;
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rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
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if (unstuff || iomap->type == IOMAP_HOLE) {
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struct gfs2_trans *tr;
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ret = gfs2_trans_begin(sdp, rblocks,
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iomap->length >> inode->i_blkbits);
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if (ret)
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@ -1153,16 +1137,17 @@ static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos,
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out_trans_end:
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gfs2_trans_end(sdp);
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out_trans_fail:
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if (alloc_required)
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gfs2_inplace_release(ip);
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gfs2_inplace_release(ip);
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out_qunlock:
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if (alloc_required)
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gfs2_quota_unlock(ip);
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out_unlock:
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gfs2_write_unlock(inode);
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gfs2_quota_unlock(ip);
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return ret;
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}
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static inline bool gfs2_iomap_need_write_lock(unsigned flags)
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{
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return (flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT);
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}
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static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
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unsigned flags, struct iomap *iomap)
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{
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@ -1173,20 +1158,39 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
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iomap->flags |= IOMAP_F_BUFFER_HEAD;
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trace_gfs2_iomap_start(ip, pos, length, flags);
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if ((flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT)) {
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ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap, &mp);
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} else {
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ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
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/*
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* Silently fall back to buffered I/O for stuffed files or if
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* we've hot a hole (see gfs2_file_direct_write).
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*/
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if ((flags & IOMAP_WRITE) && (flags & IOMAP_DIRECT) &&
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iomap->type != IOMAP_MAPPED)
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ret = -ENOTBLK;
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if (gfs2_iomap_need_write_lock(flags)) {
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ret = gfs2_write_lock(inode);
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if (ret)
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goto out;
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}
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ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
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if (ret)
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goto out_unlock;
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switch(flags & IOMAP_WRITE) {
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case IOMAP_WRITE:
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if (flags & IOMAP_DIRECT) {
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/*
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* Silently fall back to buffered I/O for stuffed files
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* or if we've got a hole (see gfs2_file_direct_write).
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*/
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if (iomap->type != IOMAP_MAPPED)
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ret = -ENOTBLK;
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goto out_unlock;
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}
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break;
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default:
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goto out_unlock;
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}
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ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap, &mp);
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out_unlock:
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if (ret && gfs2_iomap_need_write_lock(flags))
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gfs2_write_unlock(inode);
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release_metapath(&mp);
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out:
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trace_gfs2_iomap_end(ip, iomap, ret);
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return ret;
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}
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@ -1197,8 +1201,14 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) != IOMAP_WRITE)
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goto out;
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switch (flags & IOMAP_WRITE) {
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case IOMAP_WRITE:
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if (flags & IOMAP_DIRECT)
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return 0;
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break;
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default:
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return 0;
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}
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if (!gfs2_is_stuffed(ip))
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gfs2_ordered_add_inode(ip);
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@ -1231,8 +1241,8 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
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out_unlock:
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gfs2_write_unlock(inode);
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out:
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if (gfs2_iomap_need_write_lock(flags))
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gfs2_write_unlock(inode);
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return 0;
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}
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