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author | npiggin@suse.de <npiggin@suse.de> | 2009-04-26 14:25:56 +0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-06-12 05:36:02 +0400 |
commit | 864d7c4c068f23642efe91b33be3a84afe5f71e0 (patch) | |
tree | 512b253428958e95ca99274a664ace103f6bb10e /fs/file_table.c | |
parent | 96029c4e09ccbd73a6d0ed2b29e80bf2586ad7ef (diff) | |
download | linux-864d7c4c068f23642efe91b33be3a84afe5f71e0.tar.xz |
fs: move mark_files_ro into file_table.c
This function walks the s_files lock, and operates primarily on the
files in a superblock, so it better belongs here (eg. see also
fs_may_remount_ro).
[AV: ... and it shouldn't be static after that move]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/file_table.c')
-rw-r--r-- | fs/file_table.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/file_table.c b/fs/file_table.c index 3d66dbcebef6..334ce39881f8 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -399,6 +399,44 @@ too_bad: return 0; } +/** + * mark_files_ro - mark all files read-only + * @sb: superblock in question + * + * All files are marked read-only. We don't care about pending + * delete files so this should be used in 'force' mode only. + */ +void mark_files_ro(struct super_block *sb) +{ + struct file *f; + +retry: + file_list_lock(); + list_for_each_entry(f, &sb->s_files, f_u.fu_list) { + struct vfsmount *mnt; + if (!S_ISREG(f->f_path.dentry->d_inode->i_mode)) + continue; + if (!file_count(f)) + continue; + if (!(f->f_mode & FMODE_WRITE)) + continue; + f->f_mode &= ~FMODE_WRITE; + if (file_check_writeable(f) != 0) + continue; + file_release_write(f); + mnt = mntget(f->f_path.mnt); + file_list_unlock(); + /* + * This can sleep, so we can't hold + * the file_list_lock() spinlock. + */ + mnt_drop_write(mnt); + mntput(mnt); + goto retry; + } + file_list_unlock(); +} + void __init files_init(unsigned long mempages) { int n; |