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authorEric Sandeen <sandeen@redhat.com>2008-10-28 00:08:17 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-28 00:08:17 -0400
commita996031c87e093017c0763326a08896a3a4817f4 (patch)
tree74550b7108b1b1fd87393801de56bd9e1e8b1012 /fs/ext4
parent8c3bf8a01c005385e9be0bc992e10abfb355278c (diff)
delay capable() check in ext4_has_free_blocks()
As reported by Eric Paris, the capable() check in ext4_has_free_blocks() sometimes causes SELinux denials. We can rearrange the logic so that we only try to use the root-reserved blocks when necessary, and even then we can move the capable() test to last, to avoid the check most of the time. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/balloc.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index e28203ec45bd..d2003cdc36aa 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -599,18 +599,13 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
599 */ 599 */
600int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks) 600int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
601{ 601{
602 s64 free_blocks, dirty_blocks; 602 s64 free_blocks, dirty_blocks, root_blocks;
603 s64 root_blocks = 0;
604 struct percpu_counter *fbc = &sbi->s_freeblocks_counter; 603 struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
605 struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter; 604 struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
606 605
607 free_blocks = percpu_counter_read_positive(fbc); 606 free_blocks = percpu_counter_read_positive(fbc);
608 dirty_blocks = percpu_counter_read_positive(dbc); 607 dirty_blocks = percpu_counter_read_positive(dbc);
609 608 root_blocks = ext4_r_blocks_count(sbi->s_es);
610 if (!capable(CAP_SYS_RESOURCE) &&
611 sbi->s_resuid != current->fsuid &&
612 (sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
613 root_blocks = ext4_r_blocks_count(sbi->s_es);
614 609
615 if (free_blocks - (nblocks + root_blocks + dirty_blocks) < 610 if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
616 EXT4_FREEBLOCKS_WATERMARK) { 611 EXT4_FREEBLOCKS_WATERMARK) {
@@ -623,13 +618,20 @@ int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
623 } 618 }
624 } 619 }
625 /* Check whether we have space after 620 /* Check whether we have space after
626 * accounting for current dirty blocks 621 * accounting for current dirty blocks & root reserved blocks.
627 */ 622 */
628 if (free_blocks < ((root_blocks + nblocks) + dirty_blocks)) 623 if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks))
629 /* we don't have free space */ 624 return 1;
630 return 0;
631 625
632 return 1; 626 /* Hm, nope. Are (enough) root reserved blocks available? */
627 if (sbi->s_resuid == current->fsuid ||
628 ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
629 capable(CAP_SYS_RESOURCE)) {
630 if (free_blocks >= (nblocks + dirty_blocks))
631 return 1;
632 }
633
634 return 0;
633} 635}
634 636
635int ext4_claim_free_blocks(struct ext4_sb_info *sbi, 637int ext4_claim_free_blocks(struct ext4_sb_info *sbi,