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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 20:35:47 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 20:35:47 +0200
commita3719f34fdb664ffcfaec2160ef20fca7becf2ee (patch)
treef8f3ff4c4572dafe00af02ac248cd495cf523b68 /fs/ext4/super.c
parentMerge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack... (diff)
parentext4: Improve comments in ext4_quota_{on|off}() (diff)
downloadlinux-a3719f34fdb664ffcfaec2160ef20fca7becf2ee.tar.xz
linux-a3719f34fdb664ffcfaec2160ef20fca7becf2ee.zip
Merge branch 'generic' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull quota, reiserfs, udf and ext2 updates from Jan Kara: "The branch contains changes to quota code so that it does not modify persistent flags in inode->i_flags (it was the only place in kernel doing that) and handle it inside filesystem's quotaon/off handlers instead. The branch also contains two UDF cleanups, a couple of reiserfs fixes and one fix for ext2 quota locking" * 'generic' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: ext4: Improve comments in ext4_quota_{on|off}() udf: use kmap_atomic for memcpy copying udf: use octal for permissions quota: Remove dquot_quotactl_ops reiserfs: Remove i_attrs_to_sd_attrs() reiserfs: Remove useless setting of i_flags jfs: Remove jfs_get_inode_flags() ext2: Remove ext2_get_inode_flags() ext4: Remove ext4_get_inode_flags() quota: Stop setting IMMUTABLE and NOATIME flags on quota files jfs: Set flags on quota files directly ext2: Set flags on quota files directly reiserfs: Set flags on quota files directly ext4: Set flags on quota files directly reiserfs: Protect dquot_writeback_dquots() by s_umount semaphore reiserfs: Make cancel_old_flush() reliable ext2: Call dquot_writeback_dquots() with s_umount held reiserfs: avoid a -Wmaybe-uninitialized warning
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r--fs/ext4/super.c74
1 files changed, 66 insertions, 8 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a9448db1cf7e..a9c72e39a4ee 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -839,6 +839,28 @@ static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
}
}
+#ifdef CONFIG_QUOTA
+static int ext4_quota_off(struct super_block *sb, int type);
+
+static inline void ext4_quota_off_umount(struct super_block *sb)
+{
+ int type;
+
+ if (ext4_has_feature_quota(sb)) {
+ dquot_disable(sb, -1,
+ DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+ } else {
+ /* Use our quota_off function to clear inode flags etc. */
+ for (type = 0; type < EXT4_MAXQUOTAS; type++)
+ ext4_quota_off(sb, type);
+ }
+}
+#else
+static inline void ext4_quota_off_umount(struct super_block *sb)
+{
+}
+#endif
+
static void ext4_put_super(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -847,7 +869,7 @@ static void ext4_put_super(struct super_block *sb)
int i, err;
ext4_unregister_li_request(sb);
- dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+ ext4_quota_off_umount(sb);
flush_workqueue(sbi->rsv_conversion_wq);
destroy_workqueue(sbi->rsv_conversion_wq);
@@ -1218,7 +1240,6 @@ static int ext4_mark_dquot_dirty(struct dquot *dquot);
static int ext4_write_info(struct super_block *sb, int type);
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
const struct path *path);
-static int ext4_quota_off(struct super_block *sb, int type);
static int ext4_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off);
@@ -5344,11 +5365,33 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
if (err)
return err;
}
+
lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
err = dquot_quota_on(sb, type, format_id, path);
- if (err)
+ if (err) {
lockdep_set_quota_inode(path->dentry->d_inode,
I_DATA_SEM_NORMAL);
+ } else {
+ struct inode *inode = d_inode(path->dentry);
+ handle_t *handle;
+
+ /*
+ * Set inode flags to prevent userspace from messing with quota
+ * files. If this fails, we return success anyway since quotas
+ * are already enabled and this is not a hard failure.
+ */
+ inode_lock(inode);
+ handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
+ if (IS_ERR(handle))
+ goto unlock_inode;
+ EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
+ inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
+ S_NOATIME | S_IMMUTABLE);
+ ext4_mark_inode_dirty(handle, inode);
+ ext4_journal_stop(handle);
+ unlock_inode:
+ inode_unlock(inode);
+ }
return err;
}
@@ -5422,24 +5465,39 @@ static int ext4_quota_off(struct super_block *sb, int type)
{
struct inode *inode = sb_dqopt(sb)->files[type];
handle_t *handle;
+ int err;
/* Force all delayed allocation blocks to be allocated.
* Caller already holds s_umount sem */
if (test_opt(sb, DELALLOC))
sync_filesystem(sb);
- if (!inode)
+ if (!inode || !igrab(inode))
goto out;
- /* Update modification times of quota files when userspace can
- * start looking at them */
+ err = dquot_quota_off(sb, type);
+ if (err)
+ goto out_put;
+
+ inode_lock(inode);
+ /*
+ * Update modification times of quota files when userspace can
+ * start looking at them. If we fail, we return success anyway since
+ * this is not a hard failure and quotas are already disabled.
+ */
handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
if (IS_ERR(handle))
- goto out;
+ goto out_unlock;
+ EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
+ inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
inode->i_mtime = inode->i_ctime = current_time(inode);
ext4_mark_inode_dirty(handle, inode);
ext4_journal_stop(handle);
-
+out_unlock:
+ inode_unlock(inode);
+out_put:
+ iput(inode);
+ return err;
out:
return dquot_quota_off(sb, type);
}