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| author |   Abhi Das <adas@redhat.com> | 2015-03-18 12:03:41 -0500 |
|---|---|---|
| committer |   Bob Peterson <rpeterso@redhat.com> | 2015-03-18 12:46:54 -0500 |
| commit | b8fbf471edb3dbf441716fd2a52a7ca76c381381 (patch) | |
| tree | a5a2132cc29397dd1f1d8892497dbf18b2fb125f /fs/gfs2/file.c | |
| parent | GFS2: Move gfs2_file_splice_write outside of #ifdef (diff) | |
| download | linux-dev-b8fbf471edb3dbf441716fd2a52a7ca76c381381.tar.xz linux-dev-b8fbf471edb3dbf441716fd2a52a7ca76c381381.zip | |
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>
Diffstat (limited to 'fs/gfs2/file.c')
| -rw-r--r-- | fs/gfs2/file.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 7353c0a01a1e..c569adbc1431 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -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; |