From f00c9e44ad1a9660fe8cd3ca15b6cd9497172eab Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 15 Sep 2010 17:38:58 +0200 Subject: quota: Fix deadlock during path resolution As Al Viro pointed out path resolution during Q_QUOTAON calls to quotactl is prone to deadlocks. We hold s_umount semaphore for reading during the path resolution and resolution itself may need to acquire the semaphore for writing when e. g. autofs mountpoint is passed. Solve the problem by performing the resolution before we get hold of the superblock (and thus s_umount semaphore). The whole thing is complicated by the fact that some filesystems (OCFS2) ignore the path argument. So to distinguish between filesystem which want the path and which do not we introduce new .quota_on_meta callback which does not get the path. OCFS2 then uses this callback instead of old .quota_on. CC: Al Viro CC: Christoph Hellwig CC: Ted Ts'o CC: Joel Becker Signed-off-by: Jan Kara --- fs/ocfs2/super.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index 17ff46f..31c3ffd 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -993,8 +993,7 @@ static void ocfs2_disable_quotas(struct ocfs2_super *osb) } /* Handle quota on quotactl */ -static int ocfs2_quota_on(struct super_block *sb, int type, int format_id, - char *path) +static int ocfs2_quota_on(struct super_block *sb, int type, int format_id) { unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA}; @@ -1013,7 +1012,7 @@ static int ocfs2_quota_off(struct super_block *sb, int type) } static const struct quotactl_ops ocfs2_quotactl_ops = { - .quota_on = ocfs2_quota_on, + .quota_on_meta = ocfs2_quota_on, .quota_off = ocfs2_quota_off, .quota_sync = dquot_quota_sync, .get_info = dquot_get_dqinfo, -- cgit v1.1 From 7b1fff7e4fdf2805fce7afd6247912588d72d604 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Sun, 16 Jan 2011 21:16:07 +0000 Subject: ocfs2: Make OCFS2_FS depend on CONFIGFS_FS This patch fixes the following kconfig error after changing CONFIGFS_FS -> select SYSFS: fs/sysfs/Kconfig:1:error: recursive dependency detected! fs/sysfs/Kconfig:1: symbol SYSFS is selected by CONFIGFS_FS fs/configfs/Kconfig:1: symbol CONFIGFS_FS is selected by OCFS2_FS fs/ocfs2/Kconfig:1: symbol OCFS2_FS depends on SYSFS Signed-off-by: Nicholas A. Bellinger Cc: Joel Becker Cc: Randy Dunlap Cc: Stephen Rothwell Cc: James Bottomley --- fs/ocfs2/Kconfig | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/Kconfig b/fs/ocfs2/Kconfig index ab152c0..77a8de5 100644 --- a/fs/ocfs2/Kconfig +++ b/fs/ocfs2/Kconfig @@ -1,7 +1,6 @@ config OCFS2_FS tristate "OCFS2 file system support" - depends on NET && SYSFS - select CONFIGFS_FS + depends on NET && SYSFS && CONFIGFS_FS select JBD2 select CRC32 select QUOTA -- cgit v1.1 From 64c23e86873ee410554d6d1c76b60da47025e96f Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 14 Jan 2011 13:07:30 +0100 Subject: make the feature checks in ->fallocate future proof Instead of various home grown checks that might need updates for new flags just check for any bit outside the mask of the features supported by the filesystem. This makes the check future proof for any newly added flag. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/ocfs2/file.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 63e3fca..cf254ce 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1997,6 +1997,8 @@ static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset, int change_size = 1; int cmd = OCFS2_IOC_RESVSP64; + if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) + return -EOPNOTSUPP; if (!ocfs2_writes_unwritten_extents(osb)) return -EOPNOTSUPP; -- cgit v1.1 From 2fe17c1075836b66678ed2a305fd09b6773883aa Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 14 Jan 2011 13:07:43 +0100 Subject: fallocate should be a file operation Currently all filesystems except XFS implement fallocate asynchronously, while XFS forced a commit. Both of these are suboptimal - in case of O_SYNC I/O we really want our allocation on disk, especially for the !KEEP_SIZE case where we actually grow the file with user-visible zeroes. On the other hand always commiting the transaction is a bad idea for fast-path uses of fallocate like for example in recent Samba versions. Given that block allocation is a data plane operation anyway change it from an inode operation to a file operation so that we have the file structure available that lets us check for O_SYNC. This also includes moving the code around for a few of the filesystems, and remove the already unnedded S_ISDIR checks given that we only wire up fallocate for regular files. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/ocfs2/file.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index cf254ce..a665195 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1989,9 +1989,10 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd, return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0); } -static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset, +static long ocfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) { + struct inode *inode = file->f_path.dentry->d_inode; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_space_resv sr; int change_size = 1; @@ -2002,9 +2003,6 @@ static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset, if (!ocfs2_writes_unwritten_extents(osb)) return -EOPNOTSUPP; - if (S_ISDIR(inode->i_mode)) - return -ENODEV; - if (mode & FALLOC_FL_KEEP_SIZE) change_size = 0; @@ -2612,7 +2610,6 @@ const struct inode_operations ocfs2_file_iops = { .getxattr = generic_getxattr, .listxattr = ocfs2_listxattr, .removexattr = generic_removexattr, - .fallocate = ocfs2_fallocate, .fiemap = ocfs2_fiemap, }; @@ -2644,6 +2641,7 @@ const struct file_operations ocfs2_fops = { .flock = ocfs2_flock, .splice_read = ocfs2_file_splice_read, .splice_write = ocfs2_file_splice_write, + .fallocate = ocfs2_fallocate, }; const struct file_operations ocfs2_dops = { -- cgit v1.1