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Diffstat (limited to 'fs/udf/inode.c')
-rw-r--r--fs/udf/inode.c57
1 files changed, 33 insertions, 24 deletions
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 4598904be1b..7699df7b319 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -53,8 +53,7 @@ static int udf_update_inode(struct inode *, int);
static void udf_fill_inode(struct inode *, struct buffer_head *);
static int udf_sync_inode(struct inode *inode);
static int udf_alloc_i_data(struct inode *inode, size_t size);
-static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
- sector_t *, int *);
+static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
static int8_t udf_insert_aext(struct inode *, struct extent_position,
struct kernel_lb_addr, uint32_t);
static void udf_split_extents(struct inode *, int *, int, int,
@@ -151,6 +150,12 @@ const struct address_space_operations udf_aops = {
.bmap = udf_bmap,
};
+/*
+ * Expand file stored in ICB to a normal one-block-file
+ *
+ * This function requires i_data_sem for writing and releases it.
+ * This function requires i_mutex held
+ */
int udf_expand_file_adinicb(struct inode *inode)
{
struct page *page;
@@ -169,9 +174,15 @@ int udf_expand_file_adinicb(struct inode *inode)
iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
/* from now on we have normal address_space methods */
inode->i_data.a_ops = &udf_aops;
+ up_write(&iinfo->i_data_sem);
mark_inode_dirty(inode);
return 0;
}
+ /*
+ * Release i_data_sem so that we can lock a page - page lock ranks
+ * above i_data_sem. i_mutex still protects us against file changes.
+ */
+ up_write(&iinfo->i_data_sem);
page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
if (!page)
@@ -187,6 +198,7 @@ int udf_expand_file_adinicb(struct inode *inode)
SetPageUptodate(page);
kunmap(page);
}
+ down_write(&iinfo->i_data_sem);
memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
iinfo->i_lenAlloc);
iinfo->i_lenAlloc = 0;
@@ -196,17 +208,20 @@ int udf_expand_file_adinicb(struct inode *inode)
iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
/* from now on we have normal address_space methods */
inode->i_data.a_ops = &udf_aops;
+ up_write(&iinfo->i_data_sem);
err = inode->i_data.a_ops->writepage(page, &udf_wbc);
if (err) {
/* Restore everything back so that we don't lose data... */
lock_page(page);
kaddr = kmap(page);
+ down_write(&iinfo->i_data_sem);
memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
inode->i_size);
kunmap(page);
unlock_page(page);
iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
inode->i_data.a_ops = &udf_adinicb_aops;
+ up_write(&iinfo->i_data_sem);
}
page_cache_release(page);
mark_inode_dirty(inode);
@@ -310,7 +325,6 @@ static int udf_get_block(struct inode *inode, sector_t block,
struct buffer_head *bh_result, int create)
{
int err, new;
- struct buffer_head *bh;
sector_t phys = 0;
struct udf_inode_info *iinfo;
@@ -323,7 +337,6 @@ static int udf_get_block(struct inode *inode, sector_t block,
err = -EIO;
new = 0;
- bh = NULL;
iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);
@@ -332,13 +345,10 @@ static int udf_get_block(struct inode *inode, sector_t block,
iinfo->i_next_alloc_goal++;
}
- err = 0;
- bh = inode_getblk(inode, block, &err, &phys, &new);
- BUG_ON(bh);
- if (err)
+ phys = inode_getblk(inode, block, &err, &new);
+ if (!phys)
goto abort;
- BUG_ON(!phys);
if (new)
set_buffer_new(bh_result);
@@ -547,11 +557,10 @@ out:
return err;
}
-static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
- int *err, sector_t *phys, int *new)
+static sector_t inode_getblk(struct inode *inode, sector_t block,
+ int *err, int *new)
{
static sector_t last_block;
- struct buffer_head *result = NULL;
struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
struct extent_position prev_epos, cur_epos, next_epos;
int count = 0, startnum = 0, endnum = 0;
@@ -566,6 +575,8 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
int lastblock = 0;
+ *err = 0;
+ *new = 0;
prev_epos.offset = udf_file_entry_alloc_offset(inode);
prev_epos.block = iinfo->i_location;
prev_epos.bh = NULL;
@@ -635,8 +646,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
brelse(cur_epos.bh);
brelse(next_epos.bh);
newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
- *phys = newblock;
- return NULL;
+ return newblock;
}
last_block = block;
@@ -664,7 +674,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
brelse(cur_epos.bh);
brelse(next_epos.bh);
*err = ret;
- return NULL;
+ return 0;
}
c = 0;
offset = 0;
@@ -729,7 +739,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
if (!newblocknum) {
brelse(prev_epos.bh);
*err = -ENOSPC;
- return NULL;
+ return 0;
}
iinfo->i_lenExtents += inode->i_sb->s_blocksize;
}
@@ -761,10 +771,10 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
newblock = udf_get_pblock(inode->i_sb, newblocknum,
iinfo->i_location.partitionReferenceNum, 0);
- if (!newblock)
- return NULL;
- *phys = newblock;
- *err = 0;
+ if (!newblock) {
+ *err = -EIO;
+ return 0;
+ }
*new = 1;
iinfo->i_next_alloc_block = block;
iinfo->i_next_alloc_goal = newblocknum;
@@ -775,7 +785,7 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
else
mark_inode_dirty(inode);
- return result;
+ return newblock;
}
static void udf_split_extents(struct inode *inode, int *c, int offset,
@@ -1111,10 +1121,9 @@ int udf_setsize(struct inode *inode, loff_t newsize)
if (bsize <
(udf_file_entry_alloc_offset(inode) + newsize)) {
err = udf_expand_file_adinicb(inode);
- if (err) {
- up_write(&iinfo->i_data_sem);
+ if (err)
return err;
- }
+ down_write(&iinfo->i_data_sem);
} else
iinfo->i_lenAlloc = newsize;
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-29 09:06:56 +0000