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-rw-r--r--fs/dquot.c117
-rw-r--r--include/linux/quota.h3
-rw-r--r--include/linux/quotaops.h21
3 files changed, 110 insertions, 31 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
index bca3cac..9b1c4d3 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -899,6 +899,11 @@ static inline void dquot_incr_space(struct dquot *dquot, qsize_t number)
dquot->dq_dqb.dqb_curspace += number;
}
+static inline void dquot_resv_space(struct dquot *dquot, qsize_t number)
+{
+ dquot->dq_dqb.dqb_rsvspace += number;
+}
+
static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
{
if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
@@ -1068,7 +1073,11 @@ err_out:
kfree_skb(skb);
}
#endif
-
+/*
+ * Write warnings to the console and send warning messages over netlink.
+ *
+ * Note that this function can sleep.
+ */
static inline void flush_warnings(struct dquot * const *dquots, char *warntype)
{
int i;
@@ -1129,13 +1138,18 @@ static int check_idq(struct dquot *dquot, qsize_t inodes, char *warntype)
/* needs dq_data_lock */
static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *warntype)
{
+ qsize_t tspace;
+
*warntype = QUOTA_NL_NOWARN;
if (!sb_has_quota_limits_enabled(dquot->dq_sb, dquot->dq_type) ||
test_bit(DQ_FAKE_B, &dquot->dq_flags))
return QUOTA_OK;
+ tspace = dquot->dq_dqb.dqb_curspace + dquot->dq_dqb.dqb_rsvspace
+ + space;
+
if (dquot->dq_dqb.dqb_bhardlimit &&
- dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bhardlimit &&
+ tspace > dquot->dq_dqb.dqb_bhardlimit &&
!ignore_hardlimit(dquot)) {
if (!prealloc)
*warntype = QUOTA_NL_BHARDWARN;
@@ -1143,7 +1157,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war
}
if (dquot->dq_dqb.dqb_bsoftlimit &&
- dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
+ tspace > dquot->dq_dqb.dqb_bsoftlimit &&
dquot->dq_dqb.dqb_btime && get_seconds() >= dquot->dq_dqb.dqb_btime &&
!ignore_hardlimit(dquot)) {
if (!prealloc)
@@ -1152,7 +1166,7 @@ static int check_bdq(struct dquot *dquot, qsize_t space, int prealloc, char *war
}
if (dquot->dq_dqb.dqb_bsoftlimit &&
- dquot->dq_dqb.dqb_curspace + space > dquot->dq_dqb.dqb_bsoftlimit &&
+ tspace > dquot->dq_dqb.dqb_bsoftlimit &&
dquot->dq_dqb.dqb_btime == 0) {
if (!prealloc) {
*warntype = QUOTA_NL_BSOFTWARN;
@@ -1306,51 +1320,92 @@ void vfs_dq_drop(struct inode *inode)
/*
* This operation can block, but only after everything is updated
*/
-int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
+int __dquot_alloc_space(struct inode *inode, qsize_t number,
+ int warn, int reserve)
{
- int cnt, ret = NO_QUOTA;
+ int cnt, ret = QUOTA_OK;
char warntype[MAXQUOTAS];
- /* First test before acquiring mutex - solves deadlocks when we
- * re-enter the quota code and are already holding the mutex */
- if (IS_NOQUOTA(inode)) {
-out_add:
- inode_add_bytes(inode, number);
- return QUOTA_OK;
- }
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
warntype[cnt] = QUOTA_NL_NOWARN;
- down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- if (IS_NOQUOTA(inode)) { /* Now we can do reliable test... */
- up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
- goto out_add;
- }
spin_lock(&dq_data_lock);
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] == NODQUOT)
continue;
- if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt) == NO_QUOTA)
- goto warn_put_all;
+ if (check_bdq(inode->i_dquot[cnt], number, warn, warntype+cnt)
+ == NO_QUOTA) {
+ ret = NO_QUOTA;
+ goto out_unlock;
+ }
}
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] == NODQUOT)
continue;
- dquot_incr_space(inode->i_dquot[cnt], number);
+ if (reserve)
+ dquot_resv_space(inode->i_dquot[cnt], number);
+ else
+ dquot_incr_space(inode->i_dquot[cnt], number);
}
- inode_add_bytes(inode, number);
- ret = QUOTA_OK;
-warn_put_all:
+ if (!reserve)
+ inode_add_bytes(inode, number);
+out_unlock:
spin_unlock(&dq_data_lock);
- if (ret == QUOTA_OK)
- /* Dirtify all the dquots - this can block when journalling */
- for (cnt = 0; cnt < MAXQUOTAS; cnt++)
- if (inode->i_dquot[cnt])
- mark_dquot_dirty(inode->i_dquot[cnt]);
flush_warnings(inode->i_dquot, warntype);
+ return ret;
+}
+
+int dquot_alloc_space(struct inode *inode, qsize_t number, int warn)
+{
+ int cnt, ret = QUOTA_OK;
+
+ /*
+ * First test before acquiring mutex - solves deadlocks when we
+ * re-enter the quota code and are already holding the mutex
+ */
+ if (IS_NOQUOTA(inode)) {
+ inode_add_bytes(inode, number);
+ goto out;
+ }
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode)) {
+ inode_add_bytes(inode, number);
+ goto out_unlock;
+ }
+
+ ret = __dquot_alloc_space(inode, number, warn, 0);
+ if (ret == NO_QUOTA)
+ goto out_unlock;
+
+ /* Dirtify all the dquots - this can block when journalling */
+ for (cnt = 0; cnt < MAXQUOTAS; cnt++)
+ if (inode->i_dquot[cnt])
+ mark_dquot_dirty(inode->i_dquot[cnt]);
+out_unlock:
up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
+ return ret;
+}
+
+int dquot_reserve_space(struct inode *inode, qsize_t number, int warn)
+{
+ int ret = QUOTA_OK;
+
+ if (IS_NOQUOTA(inode))
+ goto out;
+
+ down_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ if (IS_NOQUOTA(inode))
+ goto out_unlock;
+
+ ret = __dquot_alloc_space(inode, number, warn, 1);
+out_unlock:
+ up_read(&sb_dqopt(inode->i_sb)->dqptr_sem);
+out:
return ret;
}
+EXPORT_SYMBOL(dquot_reserve_space);
/*
* This operation can block, but only after everything is updated
@@ -2057,7 +2112,7 @@ static void do_get_dqblk(struct dquot *dquot, struct if_dqblk *di)
spin_lock(&dq_data_lock);
di->dqb_bhardlimit = stoqb(dm->dqb_bhardlimit);
di->dqb_bsoftlimit = stoqb(dm->dqb_bsoftlimit);
- di->dqb_curspace = dm->dqb_curspace;
+ di->dqb_curspace = dm->dqb_curspace + dm->dqb_rsvspace;
di->dqb_ihardlimit = dm->dqb_ihardlimit;
di->dqb_isoftlimit = dm->dqb_isoftlimit;
di->dqb_curinodes = dm->dqb_curinodes;
@@ -2097,7 +2152,7 @@ static int do_set_dqblk(struct dquot *dquot, struct if_dqblk *di)
spin_lock(&dq_data_lock);
if (di->dqb_valid & QIF_SPACE) {
- dm->dqb_curspace = di->dqb_curspace;
+ dm->dqb_curspace = di->dqb_curspace - dm->dqb_rsvspace;
check_blim = 1;
__set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
}
diff --git a/include/linux/quota.h b/include/linux/quota.h
index d72d5d8..54b837f 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -198,6 +198,7 @@ struct mem_dqblk {
qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
qsize_t dqb_curspace; /* current used space */
+ qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
qsize_t dqb_isoftlimit; /* preferred inode limit */
qsize_t dqb_curinodes; /* current # allocated inodes */
@@ -308,6 +309,8 @@ struct dquot_operations {
int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
+ /* reserve quota for delayed block allocation */
+ int (*reserve_space) (struct inode *, qsize_t, int);
};
/* Operations handling requests from userspace */
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index 0b35b3a..3e3a0d2 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -183,6 +183,16 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
return ret;
}
+static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
+{
+ if (sb_any_quota_active(inode->i_sb)) {
+ /* Used space is updated in alloc_space() */
+ if (inode->i_sb->dq_op->reserve_space(inode, nr, 0) == NO_QUOTA)
+ return 1;
+ }
+ return 0;
+}
+
static inline int vfs_dq_alloc_inode(struct inode *inode)
{
if (sb_any_quota_active(inode->i_sb)) {
@@ -339,6 +349,11 @@ static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
return 0;
}
+static inline int vfs_dq_reserve_space(struct inode *inode, qsize_t nr)
+{
+ return 0;
+}
+
static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
{
inode_sub_bytes(inode, nr);
@@ -376,6 +391,12 @@ static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
nr << inode->i_sb->s_blocksize_bits);
}
+static inline int vfs_dq_reserve_block(struct inode *inode, qsize_t nr)
+{
+ return vfs_dq_reserve_space(inode,
+ nr << inode->i_blkbits);
+}
+
static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
{
vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
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