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authorAndreas Gruenbacher <agruenba@redhat.com>2016-06-17 15:31:27 +0300
committerBob Peterson <rpeterso@redhat.com>2016-06-27 17:47:09 +0300
commit6df9f9a253c7dc9f8ed18bf89d762de350a31813 (patch)
treea048f6fb09f9da9d1616b7f5a9c9254ce6f1d7ab /fs/gfs2/inode.c
parentcda9dd4207aeb29d0aa2298085cc2d1ebcb87e04 (diff)
downloadlinux-6df9f9a253c7dc9f8ed18bf89d762de350a31813.tar.xz
gfs2: Lock holder cleanup
Make the code more readable by cleaning up the different ways of initializing lock holders and checking for initialized lock holders: mark lock holders as uninitialized by setting the holder's glock to NULL (gfs2_holder_mark_uninitialized) instead of zeroing out the entire object or using a separate flag. Recognize initialized holders by their non-NULL glock (gfs2_holder_initialized). Don't zero out holder objects which are immeditiately initialized via gfs2_holder_init or gfs2_glock_nq_init. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/inode.c')
-rw-r--r--fs/gfs2/inode.c33
1 files changed, 15 insertions, 18 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 481b6496727d..de54d605cd09 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -127,9 +127,9 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
struct gfs2_inode *ip;
struct gfs2_glock *io_gl = NULL;
struct gfs2_holder i_gh;
- bool unlock = false;
int error;
+ gfs2_holder_mark_uninitialized(&i_gh);
inode = gfs2_iget(sb, no_addr);
if (!inode)
return ERR_PTR(-ENOMEM);
@@ -159,7 +159,6 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
GL_SKIP, &i_gh);
if (error)
goto fail_put;
- unlock = true;
if (blktype != GFS2_BLKST_FREE) {
error = gfs2_check_blk_type(sdp, no_addr,
@@ -191,7 +190,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
unlock_new_inode(inode);
}
- if (unlock)
+ if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
return inode;
@@ -203,7 +202,7 @@ fail_refresh:
fail_put:
if (io_gl)
gfs2_glock_put(io_gl);
- if (unlock)
+ if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
ip->i_gl->gl_object = NULL;
fail:
@@ -281,8 +280,8 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
struct gfs2_holder d_gh;
int error = 0;
struct inode *inode = NULL;
- int unlock = 0;
+ gfs2_holder_mark_uninitialized(&d_gh);
if (!name->len || name->len > GFS2_FNAMESIZE)
return ERR_PTR(-ENAMETOOLONG);
@@ -297,7 +296,6 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
return ERR_PTR(error);
- unlock = 1;
}
if (!is_root) {
@@ -310,7 +308,7 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
if (IS_ERR(inode))
error = PTR_ERR(inode);
out:
- if (unlock)
+ if (gfs2_holder_initialized(&d_gh))
gfs2_glock_dq_uninit(&d_gh);
if (error == -ENOENT)
return NULL;
@@ -1354,7 +1352,7 @@ 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 = { .gh_gl = NULL, };
+ struct gfs2_holder ghs[5], r_gh;
struct gfs2_rgrpd *nrgd;
unsigned int num_gh;
int dir_rename = 0;
@@ -1362,6 +1360,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
unsigned int x;
int error;
+ gfs2_holder_mark_uninitialized(&r_gh);
if (d_really_is_positive(ndentry)) {
nip = GFS2_I(d_inode(ndentry));
if (ip == nip)
@@ -1551,7 +1550,7 @@ out_gunlock:
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
- if (r_gh.gh_gl)
+ if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
@@ -1577,13 +1576,14 @@ static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
struct gfs2_sbd *sdp = GFS2_SB(odir);
- struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
+ struct gfs2_holder ghs[5], r_gh;
unsigned int num_gh;
unsigned int x;
umode_t old_mode = oip->i_inode.i_mode;
umode_t new_mode = nip->i_inode.i_mode;
int error;
+ gfs2_holder_mark_uninitialized(&r_gh);
error = gfs2_rindex_update(sdp);
if (error)
return error;
@@ -1691,7 +1691,7 @@ out_gunlock:
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
- if (r_gh.gh_gl)
+ if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
@@ -1788,9 +1788,8 @@ int gfs2_permission(struct inode *inode, int mask)
struct gfs2_inode *ip;
struct gfs2_holder i_gh;
int error;
- int unlock = 0;
-
+ gfs2_holder_mark_uninitialized(&i_gh);
ip = GFS2_I(inode);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
if (mask & MAY_NOT_BLOCK)
@@ -1798,14 +1797,13 @@ int gfs2_permission(struct inode *inode, int mask)
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)
return error;
- unlock = 1;
}
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
error = -EACCES;
else
error = generic_permission(inode, mask);
- if (unlock)
+ if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
return error;
@@ -1977,17 +1975,16 @@ static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int error;
- int unlock = 0;
+ gfs2_holder_mark_uninitialized(&gh);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error)
return error;
- unlock = 1;
}
generic_fillattr(inode, stat);
- if (unlock)
+ if (gfs2_holder_initialized(&gh))
gfs2_glock_dq_uninit(&gh);
return 0;