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Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c102
1 files changed, 79 insertions, 23 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5485390d32c5..b754b7721f51 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -40,6 +40,7 @@
#include "xattr.h"
#include "acl.h"
+#include <trace/events/ext4.h>
/*
* define how far ahead to read directories while searching them.
*/
@@ -1412,10 +1413,22 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
frame->at = entries;
frame->bh = bh;
bh = bh2;
+
+ ext4_handle_dirty_metadata(handle, dir, frame->bh);
+ ext4_handle_dirty_metadata(handle, dir, bh);
+
de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
- dx_release (frames);
- if (!(de))
+ if (!de) {
+ /*
+ * Even if the block split failed, we have to properly write
+ * out all the changes we did so far. Otherwise we can end up
+ * with corrupted filesystem.
+ */
+ ext4_mark_inode_dirty(handle, dir);
+ dx_release(frames);
return retval;
+ }
+ dx_release(frames);
retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
brelse(bh);
@@ -2183,6 +2196,7 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
struct ext4_dir_entry_2 *de;
handle_t *handle;
+ trace_ext4_unlink_enter(dir, dentry);
/* Initialize quotas before so that eventual writes go
* in separate transaction */
dquot_initialize(dir);
@@ -2228,6 +2242,7 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
end_unlink:
ext4_journal_stop(handle);
brelse(bh);
+ trace_ext4_unlink_exit(dentry, retval);
return retval;
}
@@ -2237,6 +2252,7 @@ static int ext4_symlink(struct inode *dir,
handle_t *handle;
struct inode *inode;
int l, err, retries = 0;
+ int credits;
l = strlen(symname)+1;
if (l > dir->i_sb->s_blocksize)
@@ -2244,10 +2260,26 @@ static int ext4_symlink(struct inode *dir,
dquot_initialize(dir);
+ if (l > EXT4_N_BLOCKS * 4) {
+ /*
+ * For non-fast symlinks, we just allocate inode and put it on
+ * orphan list in the first transaction => we need bitmap,
+ * group descriptor, sb, inode block, quota blocks.
+ */
+ credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
+ } else {
+ /*
+ * Fast symlink. We have to add entry to directory
+ * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS),
+ * allocate new inode (bitmap, group descriptor, inode block,
+ * quota blocks, sb is already counted in previous macros).
+ */
+ credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
+ EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
+ }
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 +
- EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
+ handle = ext4_journal_start(dir, credits);
if (IS_ERR(handle))
return PTR_ERR(handle);
@@ -2260,21 +2292,44 @@ retry:
if (IS_ERR(inode))
goto out_stop;
- if (l > sizeof(EXT4_I(inode)->i_data)) {
+ if (l > EXT4_N_BLOCKS * 4) {
inode->i_op = &ext4_symlink_inode_operations;
ext4_set_aops(inode);
/*
- * page_symlink() calls into ext4_prepare/commit_write.
- * We have a transaction open. All is sweetness. It also sets
- * i_size in generic_commit_write().
+ * We cannot call page_symlink() with transaction started
+ * because it calls into ext4_write_begin() which can wait
+ * for transaction commit if we are running out of space
+ * and thus we deadlock. So we have to stop transaction now
+ * and restart it when symlink contents is written.
+ *
+ * To keep fs consistent in case of crash, we have to put inode
+ * to orphan list in the mean time.
*/
+ drop_nlink(inode);
+ err = ext4_orphan_add(handle, inode);
+ ext4_journal_stop(handle);
+ if (err)
+ goto err_drop_inode;
err = __page_symlink(inode, symname, l, 1);
+ if (err)
+ goto err_drop_inode;
+ /*
+ * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS
+ * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
+ */
+ handle = ext4_journal_start(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto err_drop_inode;
+ }
+ inc_nlink(inode);
+ err = ext4_orphan_del(handle, inode);
if (err) {
+ ext4_journal_stop(handle);
clear_nlink(inode);
- unlock_new_inode(inode);
- ext4_mark_inode_dirty(handle, inode);
- iput(inode);
- goto out_stop;
+ goto err_drop_inode;
}
} else {
/* clear the extent format for fast symlink */
@@ -2290,6 +2345,10 @@ out_stop:
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
+err_drop_inode:
+ unlock_new_inode(inode);
+ iput(inode);
+ return err;
}
static int ext4_link(struct dentry *old_dentry,
@@ -2304,13 +2363,6 @@ static int ext4_link(struct dentry *old_dentry,
dquot_initialize(dir);
- /*
- * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
- * otherwise has the potential to corrupt the orphan inode list.
- */
- if (inode->i_nlink == 0)
- return -ENOENT;
-
retry:
handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS);
@@ -2409,6 +2461,10 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
if (!new_inode && new_dir != old_dir &&
EXT4_DIR_LINK_MAX(new_dir))
goto end_rename;
+ BUFFER_TRACE(dir_bh, "get_write_access");
+ retval = ext4_journal_get_write_access(handle, dir_bh);
+ if (retval)
+ goto end_rename;
}
if (!new_bh) {
retval = ext4_add_entry(handle, new_dentry, old_inode);
@@ -2416,7 +2472,9 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
goto end_rename;
} else {
BUFFER_TRACE(new_bh, "get write access");
- ext4_journal_get_write_access(handle, new_bh);
+ retval = ext4_journal_get_write_access(handle, new_bh);
+ if (retval)
+ goto end_rename;
new_de->inode = cpu_to_le32(old_inode->i_ino);
if (EXT4_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
EXT4_FEATURE_INCOMPAT_FILETYPE))
@@ -2477,8 +2535,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
ext4_update_dx_flag(old_dir);
if (dir_bh) {
- BUFFER_TRACE(dir_bh, "get_write_access");
- ext4_journal_get_write_access(handle, dir_bh);
PARENT_INO(dir_bh->b_data, new_dir->i_sb->s_blocksize) =
cpu_to_le32(new_dir->i_ino);
BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 01:03:36 +0300