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2012-01-07vfs: protect remounting superblock read-onlyMiklos Szeredi4-5/+61
Currently remouting superblock read-only is racy in a major way. With the per mount read-only infrastructure it is now possible to prevent most races, which this patch attempts. Before starting the remount read-only, iterate through all mounts belonging to the superblock and if none of them have any pending writes, set sb->s_readonly_remount. This indicates that remount is in progress and no further write requests are allowed. If the remount succeeds set MS_RDONLY and reset s_readonly_remount. If the remounting is unsuccessful just reset s_readonly_remount. This can result in transient EROFS errors, despite the fact the remount failed. Unfortunately hodling off writes is difficult as remount itself may touch the filesystem (e.g. through load_nls()) which would deadlock. A later patch deals with delayed writes due to nlink going to zero. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: keep list of mounts for each superblockMiklos Szeredi4-0/+11
Keep track of vfsmounts belonging to a superblock. List is protected by vfsmount_lock. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: switch ->show_options() to struct dentry *Al Viro39-91/+90
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: switch ->show_path() to struct dentry *Al Viro3-4/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: switch ->show_devname() to struct dentry *Al Viro3-12/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: switch ->show_stats to struct dentry *Al Viro5-16/+17
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07switch security_path_chmod() to struct path *Al Viro6-25/+15
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07vfs: prefer ->dentry->d_sb to ->mnt->mnt_sbAl Viro14-25/+27
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-07Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into ZAl Viro375-1471/+1008
2012-01-04vfs: trim includes a bitAl Viro3-20/+7
[folded fix for missing magic.h from Tetsuo Handa] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04switch mnt_namespace ->root to struct mountAl Viro2-7/+7
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: take /proc/*/mounts and friends to fs/proc_namespace.cAl Viro6-351/+368
rationale: that stuff is far tighter bound to fs/namespace.c than to the guts of procfs proper. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: opencode mntget() mnt_set_mountpoint()Al Viro1-1/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - remaining argument of next_mnt()Al Viro1-17/+18
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: move fsnotify junk to struct mountAl Viro6-42/+47
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: move mnt_devnameAl Viro3-11/+11
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: move mnt_list to struct mountAl Viro3-25/+26
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: switch pnode.h macros to struct mount *Al Viro3-29/+29
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: move the rest of int fields to struct mountAl Viro4-19/+21
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: mnt_id/mnt_group_id movedAl Viro5-20/+22
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: mnt_ns moved to struct mountAl Viro5-29/+30
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - mntput_no_expireAl Viro1-6/+7
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - do_add_mount and graft_treeAl Viro1-11/+11
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: take mnt_share/mnt_slave/mnt_slave_list and mnt_expire to struct mountAl Viro4-40/+41
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: and now we can make ->mnt_master point to struct mountAl Viro3-12/+12
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: take mnt_master to struct mountAl Viro4-19/+20
make IS_MNT_SLAVE take struct mount * at the same time Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - remaining argument of mnt_set_mountpoint()Al Viro3-6/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - propagate_mnt()Al Viro3-13/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - shared subtree iteratorsAl Viro1-50/+47
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - get_dominating_id / do_make_slaveAl Viro3-31/+31
next pile of horrors, similar to mnt_parent one; this time it's mnt_master. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: take mnt_child/mnt_mounts to struct mountAl Viro4-26/+26
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: all counters taken to struct mountAl Viro3-32/+32
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - work with countersAl Viro3-62/+66
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: move mnt_mountpoint to struct mountAl Viro6-24/+23
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: now it can be done - make mnt_parent point to struct mountAl Viro5-50/+53
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: mnt_parent moved to struct mountAl Viro6-29/+30
the second victim... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - is_path_reachableAl Viro3-13/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - mnt_has_parentAl Viro3-12/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - do_umount/propagate_mount_busyAl Viro3-23/+23
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount mnt_set_mountpoint child argumentAl Viro3-7/+7
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - clone_mnt/copy_tree argumentAl Viro3-32/+35
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - shrink_submounts/select_submountsAl Viro1-14/+14
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - umount_tree argumentAl Viro3-20/+20
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: the first spoils - mnt_hash movedAl Viro4-18/+18
taken out of struct vfsmount into struct mount Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount to remaining users of ->mnt_hashAl Viro1-13/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - clone_mnt/copy_tree resultAl Viro3-26/+30
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - change_mnt_propagation/set_mnt_sharedAl Viro3-14/+14
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - alloc_vfsmnt/free_vfsmnt/mnt_alloc_id/mnt_free_idAl Viro1-41/+40
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - tree_contains_unbindableAl Viro1-3/+3
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-04vfs: spread struct mount - attach_recursive_mntAl Viro1-11/+14
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-12 15:35:44 +0300