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gfs2: separate holder for rgrps in gfs2_rename 

Before this patch, gfs2_rename added a holder for the rgrp glock to
its array of holders, ghs. There's nothing wrong with that, but this
patch separates it into a separate holder. This is done to ensure
it's always locked last as per the proper glock lock ordering,
and also to pave the way for a future patch in which we will
lock the non-rgrp glocks asynchronously.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2019-08-30 12:31:00 -05:00 committed by Andreas Gruenbacher
parent bccaef9073
commit bc74aaefdd
1 changed files with 21 additions and 8 deletions
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29
fs/gfs2/inode.c
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@ -1348,7 +1348,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
struct gfs2_inode *nip = NULL;
struct gfs2_sbd *sdp = GFS2_SB(odir);
struct gfs2_holder ghs[5], r_gh;
struct gfs2_holder ghs[4], r_gh, rd_gh;
struct gfs2_rgrpd *nrgd;
unsigned int num_gh;
int dir_rename = 0;
@ -1357,6 +1357,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
int error;
gfs2_holder_mark_uninitialized(&r_gh);
gfs2_holder_mark_uninitialized(&rd_gh);
if (d_really_is_positive(ndentry)) {
nip = GFS2_I(d_inode(ndentry));
if (ip == nip)
@ -1398,13 +1399,6 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
if (nip) {
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
num_gh++;
/* grab the resource lock for unlink flag twiddling
* this is the case of the target file already existing
* so we unlink before doing the rename
*/
nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
if (nrgd)
gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
}
for (x = 0; x < num_gh; x++) {
@ -1413,6 +1407,22 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
goto out_gunlock;
}
if (nip) {
/* Grab the resource group glock for unlink flag twiddling.
* This is the case where the target dinode already exists
* so we unlink before doing the rename.
*/
nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
if (!nrgd) {
error = -ENOENT;
goto out_gunlock;
}
error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
&rd_gh);
if (error)
goto out_gunlock;
}
error = -ENOENT;
if (ip->i_inode.i_nlink == 0)
goto out_gunlock;
@ -1541,6 +1551,9 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
gfs2_quota_unlock(ndip);
out_gunlock:
gfs2_dir_no_add(&da);
if (gfs2_holder_initialized(&rd_gh))
gfs2_glock_dq_uninit(&rd_gh);
while (x--) {
gfs2_glock_dq(ghs + x);
gfs2_holder_uninit(ghs + x);