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gfs2: perform quota checks against allocation parameters 

Use struct gfs2_alloc_parms as an argument to gfs2_quota_check()
and gfs2_quota_lock_check() to check for quota violations while
accounting for the new blocks requested by the current operation
in ap->target.

Previously, the number of new blocks requested during an operation
were not accounted for during quota_check and would allow these
operations to exceed quota. This was not very apparent since most
operations allocated only 1 block at a time and quotas would get
violated in the next operation. i.e. quota excess would only be by
1 block or so. With fallocate, (where we allocate a bunch of blocks
at once) the quota excess is non-trivial and is addressed by this
patch.

Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
wifi-calibration
Abhi Das 2015-03-18 12:03:41 -05:00 committed by Bob Peterson
parent f1ea6f4ec0
commit b8fbf471ed
8 changed files with 32 additions and 27 deletions
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6
fs/gfs2/aops.c
View File

@ -671,12 +671,12 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
if (alloc_required) {
struct gfs2_alloc_parms ap = { .aflags = 0, };
error = gfs2_quota_lock_check(ip);
requested = data_blocks + ind_blocks;
ap.target = requested;
error = gfs2_quota_lock_check(ip, &ap);
if (error)
goto out_unlock;
requested = data_blocks + ind_blocks;
ap.target = requested;
error = gfs2_inplace_reserve(ip, &ap);
if (error)
goto out_qunlock;

2
fs/gfs2/bmap.c
View File

@ -1224,7 +1224,7 @@ static int do_grow(struct inode *inode, u64 size)
if (gfs2_is_stuffed(ip) &&
(size > (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)))) {
error = gfs2_quota_lock_check(ip);
error = gfs2_quota_lock_check(ip, &ap);
if (error)
return error;

15
fs/gfs2/file.c
View File

@ -429,11 +429,11 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
if (ret)
goto out_unlock;
ret = gfs2_quota_lock_check(ip);
if (ret)
goto out_unlock;
gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
ap.target = data_blocks + ind_blocks;
ret = gfs2_quota_lock_check(ip, &ap);
if (ret)
goto out_unlock;
ret = gfs2_inplace_reserve(ip, &ap);
if (ret)
goto out_quota_unlock;
@ -827,13 +827,13 @@ static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t
offset += bytes;
continue;
}
error = gfs2_quota_lock_check(ip);
if (error)
return error;
retry:
gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
ap.target = data_blocks + ind_blocks;
error = gfs2_quota_lock_check(ip, &ap);
if (error)
return error;
error = gfs2_inplace_reserve(ip, &ap);
if (error) {
if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
@ -841,6 +841,7 @@ retry:
bytes &= bsize_mask;
if (bytes == 0)
bytes = sdp->sd_sb.sb_bsize;
gfs2_quota_unlock(ip);
goto retry;
}
goto out_qunlock;

2
fs/gfs2/incore.h
View File

@ -301,7 +301,7 @@ struct gfs2_blkreserv {
* to the allocation code.
*/
struct gfs2_alloc_parms {
u32 target;
u64 target;
u32 aflags;
};

18
fs/gfs2/inode.c
View File

@ -382,7 +382,7 @@ static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
int error;
error = gfs2_quota_lock_check(ip);
error = gfs2_quota_lock_check(ip, &ap);
if (error)
goto out;
@ -525,7 +525,7 @@ static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
int error;
if (da->nr_blocks) {
error = gfs2_quota_lock_check(dip);
error = gfs2_quota_lock_check(dip, &ap);
if (error)
goto fail_quota_locks;
@ -953,7 +953,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
if (da.nr_blocks) {
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
error = gfs2_quota_lock_check(dip);
error = gfs2_quota_lock_check(dip, &ap);
if (error)
goto out_gunlock;
@ -1470,7 +1470,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
if (da.nr_blocks) {
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
error = gfs2_quota_lock_check(ndip);
error = gfs2_quota_lock_check(ndip, &ap);
if (error)
goto out_gunlock;
@ -1669,6 +1669,7 @@ static int setattr_chown(struct inode *inode, struct iattr *attr)
kuid_t ouid, nuid;
kgid_t ogid, ngid;
int error;
struct gfs2_alloc_parms ap;
ouid = inode->i_uid;
ogid = inode->i_gid;
@ -1696,9 +1697,11 @@ static int setattr_chown(struct inode *inode, struct iattr *attr)
if (error)
goto out;
ap.target = gfs2_get_inode_blocks(&ip->i_inode);
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
error = gfs2_quota_check(ip, nuid, ngid);
error = gfs2_quota_check(ip, nuid, ngid, &ap);
if (error)
goto out_gunlock_q;
}
@ -1713,9 +1716,8 @@ static int setattr_chown(struct inode *inode, struct iattr *attr)
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
gfs2_quota_change(ip, -blocks, ouid, ogid);
gfs2_quota_change(ip, blocks, nuid, ngid);
gfs2_quota_change(ip, -ap.target, ouid, ogid);
gfs2_quota_change(ip, ap.target, nuid, ngid);
}
out_end_trans:

6
fs/gfs2/quota.c
View File

@ -1094,7 +1094,8 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
return 0;
}
int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
struct gfs2_alloc_parms *ap)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_quota_data *qd;
@ -1117,14 +1118,13 @@ int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
spin_lock(&qd_lock);
value += qd->qd_change;
value += qd->qd_change + ap->target;
spin_unlock(&qd_lock);
if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
print_message(qd, "exceeded");
quota_send_warning(qd->qd_id,
sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
error = -EDQUOT;
break;
} else if (be64_to_cpu(qd->qd_qb.qb_warn) &&

8
fs/gfs2/quota.h
View File

@ -24,7 +24,8 @@ extern void gfs2_quota_unhold(struct gfs2_inode *ip);
extern int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
extern void gfs2_quota_unlock(struct gfs2_inode *ip);
extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
struct gfs2_alloc_parms *ap);
extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
kuid_t uid, kgid_t gid);
@ -37,7 +38,8 @@ extern int gfs2_quotad(void *data);
extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
struct gfs2_alloc_parms *ap)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
int ret;
@ -48,7 +50,7 @@ static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
return ret;
if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
return 0;
ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid, ap);
if (ret)
gfs2_quota_unlock(ip);
return ret;

2
fs/gfs2/xattr.c
View File

@ -732,7 +732,7 @@ static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
if (error)
return error;
error = gfs2_quota_lock_check(ip);
error = gfs2_quota_lock_check(ip, &ap);
if (error)
return error;