summaryrefslogtreecommitdiff
path: root/fs/quota/quota_v2.c
AgeCommit message (Collapse)Author
2017-09-27quota: Fix quota corruption with generic/232 testJan Kara
Eric has reported that since commit d2faa415166b "quota: Do not acquire dqio_sem for dquot overwrites in v2 format" test generic/232 occasionally fails due to quota information being incorrect. Indeed that commit was too eager to remove dqio_sem completely from the path that just overwrites quota structure with updated information. Although that is innocent on its own, another process that inserts new quota structure to the same block can perform read-modify-write cycle of that block thus effectively discarding quota information update if they race in a wrong way. Fix the problem by acquiring dqio_sem for reading for overwrites of quota structure. Note that it *is* possible to completely avoid taking dqio_sem in the overwrite path however that will require modifying path inserting / deleting quota structures to avoid RMW cycles of the full block and for now it is not clear whether it is worth the hassle. Fixes: d2faa415166b2883428efa92f451774ef44373ac Reported-and-tested-by: Eric Whitney <enwlinux@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
2017-09-07Merge branch 'quota_scaling' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull quota scaling updates from Jan Kara: "This contains changes to make the quota subsystem more scalable. Reportedly it improves number of files created per second on ext4 filesystem on fast storage by about a factor of 2x" * 'quota_scaling' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (28 commits) quota: Add lock annotations to struct members quota: Reduce contention on dq_data_lock fs: Provide __inode_get_bytes() quota: Inline dquot_[re]claim_reserved_space() into callsite quota: Inline inode_{incr,decr}_space() into callsites quota: Inline functions into their callsites ext4: Disable dirty list tracking of dquots when journalling quotas quota: Allow disabling tracking of dirty dquots in a list quota: Remove dq_wait_unused from dquot quota: Move locking into clear_dquot_dirty() quota: Do not dirty bad dquots quota: Fix possible corruption of dqi_flags quota: Propagate ->quota_read errors from v2_read_file_info() quota: Fix error codes in v2_read_file_info() quota: Push dqio_sem down to ->read_file_info() quota: Push dqio_sem down to ->write_file_info() quota: Push dqio_sem down to ->get_next_id() quota: Push dqio_sem down to ->release_dqblk() quota: Remove locking for writing to the old quota format quota: Do not acquire dqio_sem for dquot overwrites in v2 format ...
2017-08-21quota_v2: Delete an error message for a failed memory allocation in ↵Markus Elfring
v2_read_file_info() Omit an extra message for a memory allocation failure in this function. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Propagate ->quota_read errors from v2_read_file_info()Jan Kara
Currently we return -EIO on any error (or short read) from ->quota_read() while reading quota info. Propagate the error code instead. Suggested-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Fix error codes in v2_read_file_info()Jan Kara
v2_read_file_info() returned -1 instead of proper error codes on error. Luckily this is not easily visible from userspace as we have called ->check_quota_file shortly before and thus already verified the quota file is sane. Still set the error codes to proper values. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->read_file_info()Jan Kara
Push down acquisition of dqio_sem into ->read_file_info() callback. This is for consistency with other operations and it also allows us to get rid of an ugliness in OCFS2. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->write_file_info()Jan Kara
Push down acquisition of dqio_sem into ->write_file_info() callback. Mostly for consistency with other operations. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->get_next_id()Jan Kara
Push down acquisition of dqio_sem into ->get_next_id() callback. Mostly for consistency with other operations. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->release_dqblk()Jan Kara
Push down acquisition of dqio_sem into ->release_dqblk() callback. It will allow quota formats to decide whether they need it or not. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Do not acquire dqio_sem for dquot overwrites in v2 formatJan Kara
When dquot has space already allocated in a quota file, we just overwrite that place when writing dquot. So we don't need any protection against other modifications of quota file as these keep dquot in place. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->write_dqblk()Jan Kara
Push down acquisition of dqio_sem into ->write_dqblk() callback. It will allow quota formats to decide whether they need it or not. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2017-08-17quota: Push dqio_sem down to ->read_dqblk()Jan Kara
Push down acquisition of dqio_sem into ->read_dqblk() callback. It will allow quota formats to decide whether they need it or not. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Jan Kara <jack@suse.cz>
2016-02-09quota_v2: Implement get_next_id() for V2 quota formatJan Kara
Implement functions to get id of next existing quota structure in quota file for quota tree based formats and thus for V2 quota format. Signed-off-by: Jan Kara <jack@suse.cz>
2016-01-04quota: constify qtree_fmt_operations structuresJulia Lawall
The qtree_fmt_operations structures are never modified, so declare them as const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Jan Kara <jack@suse.cz>
2015-03-04quota: Fix maximum quota limit settingsJan Kara
Currently quota format that supports 64-bit usage sets maximum quota limit as 2^64-1. However quota core code uses signed numbers to track usage and even limits themselves are stored in long long. Checking of maximum allowable limits worked by luck until commit 14bf61ffe6ac (quota: Switch ->get_dqblk() and ->set_dqblk() to use bytes as space units) because variable we compared with was unsigned. After that commit the type we compared against changed to signed and thus checks for maximum limits with the newest VFS quota format started to refuse any non-negative value. Later the problem was inadvertedly fixed by commit b10a08194c2b (quota: Store maximum space limit in bytes) because we started to compare against unsigned type as well. Fix possible future problems of this kind by setting maximum limits to 2^63-1 to avoid overflow issues. Reported-by: Carlos Carvalho <carlos@fisica.ufpr.br> Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-30quota: Store maximum space limit in bytesJan Kara
Currently maximum space limit quota format supports is in blocks however since we store space limits in bytes, this is somewhat confusing. So store the maximum limit in bytes as well. Also rename the field to match the new unit and related inode field to match the new naming scheme. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2015-01-21quota: Don't store flags for v2 quota formatJan Kara
Currently, v2 quota format blindly stored flags from in-memory dqinfo on disk, although there are no flags supported. Since it is stupid to store flags which have no effect, just store 0 unconditionally and don't bother loading it from disk. Note that userspace could have stored some flags there via Q_SETINFO quotactl and then later read them (although flags have no effect) but I'm pretty sure noone does that (most definitely quota-tools don't and quota interface doesn't have too much other users). Signed-off-by: Jan Kara <jack@suse.cz>
2012-09-18userns: Convert struct dquot dq_id to be a struct kqidEric W. Biederman
Change struct dquot dq_id to a struct kqid and remove the now unecessary dq_type. Make minimal changes to dquot, quota_tree, quota_v1, quota_v2, ext3, ext4, and ocfs2 to deal with the change in quota structures and signatures. The ocfs2 changes are larger than most because of the extensive tracing throughout the ocfs2 quota code that prints out dq_id. quota_tree.c:get_index is modified to take a struct kqid instead of a qid_t because all of it's callers pass in dquot->dq_id and it allows me to introduce only a single conversion. The rest of the changes are either just replacing dq_type with dq_id.type, adding conversions to deal with the change in type and occassionally adding qid_eq to allow quota id comparisons in a user namespace safe way. Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Jan Kara <jack@suse.cz> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Theodore Tso <tytso@mit.edu> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2011-02-24quota: return -ENOMEM when memory allocation failsDavidlohr Bueso
Signed-off-by: Davidlohr Bueso <dave@gnu.org> Signed-off-by: Jan Kara <jack@suse.cz>
2010-07-21quota: Change quota error message to print out disk and function nameJiaying Zhang
The current quota error message doesn't always print the disk name, so it is hard to identify the "bad" disk when quota error happens. This patch changes the standardized quota error message to print out disk name and function name. It also uses a combination of cpp macro and inline function to provide better type checking and to lower the text size of the message. [Jan Kara: Export __quota_error] Signed-off-by: Jiaying Zhang <jiayingz@google.com> Signed-off-by: Jan Kara <jack@suse.cz>
2010-05-21dquot: Detect partial write error to quota file in write_blk() and add ↵Jiaying Zhang
printk_ratelimit for quota error messages This patch changes quota_tree.c:write_blk() to detect error caused by partial write to quota file and add a macro to limit control printed quota error messages so we won't fill up dmesg with a corrupted quota file. Signed-off-by: Jiaying Zhang <jiayingz@google.com> Signed-off-by: Jan Kara <jack@suse.cz>
2009-12-23quota: Improve checking of quota file headerJan Kara
When we are asked for vfsv0 quota format and the file is in vfsv1 format (or vice versa), refuse to use the quota file. Also return with error when we don't like the header of quota file. Signed-off-by: Jan Kara <jack@suse.cz>
2009-12-23quota: Fix 64-bit limits setting on 32-bit archsJan Kara
Fix warnings: fs/quota/quota_v2.c: In function ‘v2_read_file_info’: fs/quota/quota_v2.c:123: warning: integer constant is too large for ‘long’ type fs/quota/quota_v2.c:124: warning: integer constant is too large for ‘long’ type Reported-by: Jerry Leo <jerryleo860202@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
2009-12-10quota: Implement quota format with 64-bit space and inode limitsJan Kara
So far the maximum quota space limit was 4TB. Apparently this isn't enough for Lustre guys anymore. So implement new quota format which raises block limits to 2^64 bytes. Also store number of inodes and inode limits in 64-bit variables as 2^32 files isn't that insanely high anymore. The first version of the patch has been developed by Andrew Perepechko <Andrew.Perepechko@Sun.COM>. CC: Andrew.Perepechko@Sun.COM Signed-off-by: Jan Kara <jack@suse.cz>
2009-12-10const: struct quota_format_opsAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
2009-03-26quota: Coding style fixesJan Kara
Wrap long lines, remove assignments from conditions, rewrite two overcomplicated for loops. Signed-off-by: Jan Kara <jack@suse.cz>
2009-03-26quota: Move quota files into separate directoryJan Kara
Quota subsystem has more and more files. It's time to create a dir for it. Signed-off-by: Jan Kara <jack@suse.cz>