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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-10 11:26:52 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-10 11:26:52 -0700 |
commit | 5f248c9c251c60af3403902b26e08de43964ea0b (patch) | |
tree | 6d3328e72a7e4015a64017eb30be18095c6a3c64 /fs/statfs.c | |
parent | f6cec0ae58c17522a7bc4e2f39dae19f199ab534 (diff) | |
parent | dca332528bc69e05f67161e1ed59929633d5e63d (diff) | |
download | linux-5f248c9c251c60af3403902b26e08de43964ea0b.tar.bz2 |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (96 commits)
no need for list_for_each_entry_safe()/resetting with superblock list
Fix sget() race with failing mount
vfs: don't hold s_umount over close_bdev_exclusive() call
sysv: do not mark superblock dirty on remount
sysv: do not mark superblock dirty on mount
btrfs: remove junk sb_dirt change
BFS: clean up the superblock usage
AFFS: wait for sb synchronization when needed
AFFS: clean up dirty flag usage
cifs: truncate fallout
mbcache: fix shrinker function return value
mbcache: Remove unused features
add f_flags to struct statfs(64)
pass a struct path to vfs_statfs
update VFS documentation for method changes.
All filesystems that need invalidate_inode_buffers() are doing that explicitly
convert remaining ->clear_inode() to ->evict_inode()
Make ->drop_inode() just return whether inode needs to be dropped
fs/inode.c:clear_inode() is gone
fs/inode.c:evict() doesn't care about delete vs. non-delete paths now
...
Fix up trivial conflicts in fs/nilfs2/super.c
Diffstat (limited to 'fs/statfs.c')
-rw-r--r-- | fs/statfs.c | 95 |
1 files changed, 71 insertions, 24 deletions
diff --git a/fs/statfs.c b/fs/statfs.c index 4ef021f3b612..30ea8c8a996b 100644 --- a/fs/statfs.c +++ b/fs/statfs.c @@ -2,38 +2,83 @@ #include <linux/module.h> #include <linux/fs.h> #include <linux/file.h> +#include <linux/mount.h> #include <linux/namei.h> #include <linux/statfs.h> #include <linux/security.h> #include <linux/uaccess.h> -int vfs_statfs(struct dentry *dentry, struct kstatfs *buf) +static int flags_by_mnt(int mnt_flags) { - int retval = -ENODEV; - - if (dentry) { - retval = -ENOSYS; - if (dentry->d_sb->s_op->statfs) { - memset(buf, 0, sizeof(*buf)); - retval = security_sb_statfs(dentry); - if (retval) - return retval; - retval = dentry->d_sb->s_op->statfs(dentry, buf); - if (retval == 0 && buf->f_frsize == 0) - buf->f_frsize = buf->f_bsize; - } - } + int flags = 0; + + if (mnt_flags & MNT_READONLY) + flags |= ST_RDONLY; + if (mnt_flags & MNT_NOSUID) + flags |= ST_NOSUID; + if (mnt_flags & MNT_NODEV) + flags |= ST_NODEV; + if (mnt_flags & MNT_NOEXEC) + flags |= ST_NOEXEC; + if (mnt_flags & MNT_NOATIME) + flags |= ST_NOATIME; + if (mnt_flags & MNT_NODIRATIME) + flags |= ST_NODIRATIME; + if (mnt_flags & MNT_RELATIME) + flags |= ST_RELATIME; + return flags; +} + +static int flags_by_sb(int s_flags) +{ + int flags = 0; + if (s_flags & MS_SYNCHRONOUS) + flags |= ST_SYNCHRONOUS; + if (s_flags & MS_MANDLOCK) + flags |= ST_MANDLOCK; + return flags; +} + +static int calculate_f_flags(struct vfsmount *mnt) +{ + return ST_VALID | flags_by_mnt(mnt->mnt_flags) | + flags_by_sb(mnt->mnt_sb->s_flags); +} + +int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf) +{ + int retval; + + if (!dentry->d_sb->s_op->statfs) + return -ENOSYS; + + memset(buf, 0, sizeof(*buf)); + retval = security_sb_statfs(dentry); + if (retval) + return retval; + retval = dentry->d_sb->s_op->statfs(dentry, buf); + if (retval == 0 && buf->f_frsize == 0) + buf->f_frsize = buf->f_bsize; return retval; } +int vfs_statfs(struct path *path, struct kstatfs *buf) +{ + int error; + + error = statfs_by_dentry(path->dentry, buf); + if (!error) + buf->f_flags = calculate_f_flags(path->mnt); + return error; +} EXPORT_SYMBOL(vfs_statfs); -static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf) +static int do_statfs_native(struct path *path, struct statfs *buf) { struct kstatfs st; int retval; - retval = vfs_statfs(dentry, &st); + retval = vfs_statfs(path, &st); if (retval) return retval; @@ -67,17 +112,18 @@ static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf) buf->f_fsid = st.f_fsid; buf->f_namelen = st.f_namelen; buf->f_frsize = st.f_frsize; + buf->f_flags = st.f_flags; memset(buf->f_spare, 0, sizeof(buf->f_spare)); } return 0; } -static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf) +static int do_statfs64(struct path *path, struct statfs64 *buf) { struct kstatfs st; int retval; - retval = vfs_statfs(dentry, &st); + retval = vfs_statfs(path, &st); if (retval) return retval; @@ -94,6 +140,7 @@ static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf) buf->f_fsid = st.f_fsid; buf->f_namelen = st.f_namelen; buf->f_frsize = st.f_frsize; + buf->f_flags = st.f_flags; memset(buf->f_spare, 0, sizeof(buf->f_spare)); } return 0; @@ -107,7 +154,7 @@ SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, b error = user_path(pathname, &path); if (!error) { struct statfs tmp; - error = vfs_statfs_native(path.dentry, &tmp); + error = do_statfs_native(&path, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; path_put(&path); @@ -125,7 +172,7 @@ SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct stat error = user_path(pathname, &path); if (!error) { struct statfs64 tmp; - error = vfs_statfs64(path.dentry, &tmp); + error = do_statfs64(&path, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; path_put(&path); @@ -143,7 +190,7 @@ SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) file = fget(fd); if (!file) goto out; - error = vfs_statfs_native(file->f_path.dentry, &tmp); + error = do_statfs_native(&file->f_path, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; fput(file); @@ -164,7 +211,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user file = fget(fd); if (!file) goto out; - error = vfs_statfs64(file->f_path.dentry, &tmp); + error = do_statfs64(&file->f_path, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; fput(file); @@ -183,7 +230,7 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) if (!s) return -EINVAL; - err = vfs_statfs(s->s_root, &sbuf); + err = statfs_by_dentry(s->s_root, &sbuf); drop_super(s); if (err) return err; |