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Added new ext4 debugging ioctls to allow userspace to get information 

about the state of the extent status cache.
 
 Dropped workaround for pre-1970 dates which were encoded incorrectly
 in pre-4.4 kernels.  Since both the kernel correctly generates, and
 e2fsck detects and fixes this issue for the past four years, it'e time
 to drop the workaround.  (Also, it's not like files with dates in the
 distant past were all that common in the first place.)
 
 A lot of miscellaneous bug fixes and cleanups, including some ext4
 Documentation fixes.  Also included are two minor bug fixes in
 fs/unicode.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "Added new ext4 debugging ioctls to allow userspace to get information
  about the state of the extent status cache.

  Dropped workaround for pre-1970 dates which were encoded incorrectly
  in pre-4.4 kernels. Since both the kernel correctly generates, and
  e2fsck detects and fixes this issue for the past four years, it'e time
  to drop the workaround. (Also, it's not like files with dates in the
  distant past were all that common in the first place.)

  A lot of miscellaneous bug fixes and cleanups, including some ext4
  Documentation fixes. Also included are two minor bug fixes in
  fs/unicode"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (21 commits)
  unicode: make array 'token' static const, makes object smaller
  unicode: Move static keyword to the front of declarations
  ext4: add missing bigalloc documentation.
  ext4: fix kernel oops caused by spurious casefold flag
  ext4: fix integer overflow when calculating commit interval
  ext4: use percpu_counters for extent_status cache hits/misses
  ext4: fix potential use after free after remounting with noblock_validity
  jbd2: add missing tracepoint for reserved handle
  ext4: fix punch hole for inline_data file systems
  ext4: rework reserved cluster accounting when invalidating pages
  ext4: documentation fixes
  ext4: treat buffers with write errors as containing valid data
  ext4: fix warning inside ext4_convert_unwritten_extents_endio
  ext4: set error return correctly when ext4_htree_store_dirent fails
  ext4: drop legacy pre-1970 encoding workaround
  ext4: add new ioctl EXT4_IOC_GET_ES_CACHE
  ext4: add a new ioctl EXT4_IOC_GETSTATE
  ext4: add a new ioctl EXT4_IOC_CLEAR_ES_CACHE
  jbd2: flush_descriptor(): Do not decrease buffer head's ref count
  ext4: remove unnecessary error check
  ...
This commit is contained in:
Linus Torvalds 2019-09-21 13:37:39 -07:00
parent 104c0d6bc4 040823b537
commit 70cb0d02b5
24 changed files with 894 additions and 313 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
Documentation/filesystems/ext4/bigalloc.rst
View File

@ -9,14 +9,26 @@ ext4 code is not prepared to handle the case where the block size
exceeds the page size. However, for a filesystem of mostly huge files,
it is desirable to be able to allocate disk blocks in units of multiple
blocks to reduce both fragmentation and metadata overhead. The
`bigalloc <Bigalloc>`__ feature provides exactly this ability. The
administrator can set a block cluster size at mkfs time (which is stored
in the s\_log\_cluster\_size field in the superblock); from then on, the
block bitmaps track clusters, not individual blocks. This means that
block groups can be several gigabytes in size (instead of just 128MiB);
however, the minimum allocation unit becomes a cluster, not a block,
even for directories. TaoBao had a patchset to extend the “use units of
clusters instead of blocks” to the extent tree, though it is not clear
where those patches went-- they eventually morphed into “extent tree v2”
but that code has not landed as of May 2015.
bigalloc feature provides exactly this ability.
The bigalloc feature (EXT4_FEATURE_RO_COMPAT_BIGALLOC) changes ext4 to
use clustered allocation, so that each bit in the ext4 block allocation
bitmap addresses a power of two number of blocks. For example, if the
file system is mainly going to be storing large files in the 4-32
megabyte range, it might make sense to set a cluster size of 1 megabyte.
This means that each bit in the block allocation bitmap now addresses
256 4k blocks. This shrinks the total size of the block allocation
bitmaps for a 2T file system from 64 megabytes to 256 kilobytes. It also
means that a block group addresses 32 gigabytes instead of 128 megabytes,
also shrinking the amount of file system overhead for metadata.
The administrator can set a block cluster size at mkfs time (which is
stored in the s\_log\_cluster\_size field in the superblock); from then
on, the block bitmaps track clusters, not individual blocks. This means
that block groups can be several gigabytes in size (instead of just
128MiB); however, the minimum allocation unit becomes a cluster, not a
block, even for directories. TaoBao had a patchset to extend the “use
units of clusters instead of blocks” to the extent tree, though it is
not clear where those patches went-- they eventually morphed into
“extent tree v2” but that code has not landed as of May 2015.

10
Documentation/filesystems/ext4/blockgroup.rst
View File

@ -71,11 +71,11 @@ if the flex\_bg size is 4, then group 0 will contain (in order) the
superblock, group descriptors, data block bitmaps for groups 0-3, inode
bitmaps for groups 0-3, inode tables for groups 0-3, and the remaining
space in group 0 is for file data. The effect of this is to group the
block metadata close together for faster loading, and to enable large
files to be continuous on disk. Backup copies of the superblock and
group descriptors are always at the beginning of block groups, even if
flex\_bg is enabled. The number of block groups that make up a flex\_bg
is given by 2 ^ ``sb.s_log_groups_per_flex``.
block group metadata close together for faster loading, and to enable
large files to be continuous on disk. Backup copies of the superblock
and group descriptors are always at the beginning of block groups, even
if flex\_bg is enabled. The number of block groups that make up a
flex\_bg is given by 2 ^ ``sb.s_log_groups_per_flex``.
Meta Block Groups
-----------------

4
Documentation/filesystems/ext4/blocks.rst
View File

@ -10,7 +10,9 @@ block groups. Block size is specified at mkfs time and typically is
4KiB. You may experience mounting problems if block size is greater than
page size (i.e. 64KiB blocks on a i386 which only has 4KiB memory
pages). By default a filesystem can contain 2^32 blocks; if the '64bit'
feature is enabled, then a filesystem can have 2^64 blocks.
feature is enabled, then a filesystem can have 2^64 blocks. The location
of structures is stored in terms of the block number the structure lives
in and not the absolute offset on disk.
For 32-bit filesystems, limits are as follows:

2
Documentation/filesystems/ext4/directory.rst
View File

@ -59,7 +59,7 @@ is at most 263 bytes long, though on disk you'll need to reference
- File name.
Since file names cannot be longer than 255 bytes, the new directory
entry format shortens the rec\_len field and uses the space for a file
entry format shortens the name\_len field and uses the space for a file
type flag, probably to avoid having to load every inode during directory
tree traversal. This format is ``ext4_dir_entry_2``, which is at most
263 bytes long, though on disk you'll need to reference

9
Documentation/filesystems/ext4/group_descr.rst
View File

@ -99,9 +99,12 @@ The block group descriptor is laid out in ``struct ext4_group_desc``.
* - 0x1E
- \_\_le16
- bg\_checksum
- Group descriptor checksum; crc16(sb\_uuid+group+desc) if the
RO\_COMPAT\_GDT\_CSUM feature is set, or crc32c(sb\_uuid+group\_desc) &
0xFFFF if the RO\_COMPAT\_METADATA\_CSUM feature is set.
- Group descriptor checksum; crc16(sb\_uuid+group\_num+bg\_desc) if the
RO\_COMPAT\_GDT\_CSUM feature is set, or
crc32c(sb\_uuid+group\_num+bg\_desc) & 0xFFFF if the
RO\_COMPAT\_METADATA\_CSUM feature is set. The bg\_checksum
field in bg\_desc is skipped when calculating crc16 checksum,
and set to zero if crc32c checksum is used.
* -
-
-

4
Documentation/filesystems/ext4/inodes.rst
View File

@ -472,8 +472,8 @@ inode, which allows struct ext4\_inode to grow for a new kernel without
having to upgrade all of the on-disk inodes. Access to fields beyond
EXT2\_GOOD\_OLD\_INODE\_SIZE should be verified to be within
``i_extra_isize``. By default, ext4 inode records are 256 bytes, and (as
of October 2013) the inode structure is 156 bytes
(``i_extra_isize = 28``). The extra space between the end of the inode
of August 2019) the inode structure is 160 bytes
(``i_extra_isize = 32``). The extra space between the end of the inode
structure and the end of the inode record can be used to store extended
attributes. Each inode record can be as large as the filesystem block
size, though this is not terribly efficient.

20
Documentation/filesystems/ext4/super.rst
View File

@ -58,7 +58,7 @@ The ext4 superblock is laid out as follows in
* - 0x1C
- \_\_le32
- s\_log\_cluster\_size
- Cluster size is (2 ^ s\_log\_cluster\_size) blocks if bigalloc is
- Cluster size is 2 ^ (10 + s\_log\_cluster\_size) blocks if bigalloc is
enabled. Otherwise s\_log\_cluster\_size must equal s\_log\_block\_size.
* - 0x20
- \_\_le32
@ -447,7 +447,7 @@ The ext4 superblock is laid out as follows in
- Upper 8 bits of the s_wtime field.
* - 0x275
- \_\_u8
- s\_wtime_hi
- s\_mtime_hi
- Upper 8 bits of the s_mtime field.
* - 0x276
- \_\_u8
@ -466,12 +466,20 @@ The ext4 superblock is laid out as follows in
- s\_last_error_time_hi
- Upper 8 bits of the s_last_error_time_hi field.
* - 0x27A
- \_\_u8[2]
- s\_pad
- \_\_u8
- s\_pad[2]
- Zero padding.
* - 0x27C
- \_\_le16
- s\_encoding
- Filename charset encoding.
* - 0x27E
- \_\_le16
- s\_encoding_flags
- Filename charset encoding flags.
* - 0x280
- \_\_le32
- s\_reserved[96]
- s\_reserved[95]
- Padding to the end of the block.
* - 0x3FC
- \_\_le32
@ -617,7 +625,7 @@ following:
* - 0x80
- Enable a filesystem size of 2^64 blocks (INCOMPAT\_64BIT).
* - 0x100
- Multiple mount protection. Not implemented (INCOMPAT\_MMP).
- Multiple mount protection (INCOMPAT\_MMP).
* - 0x200
- Flexible block groups. See the earlier discussion of this feature
(INCOMPAT\_FLEX\_BG).

197
fs/ext4/block_validity.c
View File

@ -38,6 +38,7 @@ int __init ext4_init_system_zone(void)
void ext4_exit_system_zone(void)
{
rcu_barrier();
kmem_cache_destroy(ext4_system_zone_cachep);
}
@ -49,17 +50,26 @@ static inline int can_merge(struct ext4_system_zone *entry1,
return 0;
}
static void release_system_zone(struct ext4_system_blocks *system_blks)
{
struct ext4_system_zone *entry, *n;
rbtree_postorder_for_each_entry_safe(entry, n,
&system_blks->root, node)
kmem_cache_free(ext4_system_zone_cachep, entry);
}
/*
* Mark a range of blocks as belonging to the "system zone" --- that
* is, filesystem metadata blocks which should never be used by
* inodes.
*/
static int add_system_zone(struct ext4_sb_info *sbi,
static int add_system_zone(struct ext4_system_blocks *system_blks,
ext4_fsblk_t start_blk,
unsigned int count)
{
struct ext4_system_zone *new_entry = NULL, *entry;
struct rb_node **n = &sbi->system_blks.rb_node, *node;
struct rb_node **n = &system_blks->root.rb_node, *node;
struct rb_node *parent = NULL, *new_node = NULL;
while (*n) {
@ -91,7 +101,7 @@ static int add_system_zone(struct ext4_sb_info *sbi,
new_node = &new_entry->node;
rb_link_node(new_node, parent, n);
rb_insert_color(new_node, &sbi->system_blks);
rb_insert_color(new_node, &system_blks->root);
}
/* Can we merge to the left? */
@ -101,7 +111,7 @@ static int add_system_zone(struct ext4_sb_info *sbi,
if (can_merge(entry, new_entry)) {
new_entry->start_blk = entry->start_blk;
new_entry->count += entry->count;
rb_erase(node, &sbi->system_blks);
rb_erase(node, &system_blks->root);
kmem_cache_free(ext4_system_zone_cachep, entry);
}
}
@ -112,7 +122,7 @@ static int add_system_zone(struct ext4_sb_info *sbi,
entry = rb_entry(node, struct ext4_system_zone, node);
if (can_merge(new_entry, entry)) {
new_entry->count += entry->count;
rb_erase(node, &sbi->system_blks);
rb_erase(node, &system_blks->root);
kmem_cache_free(ext4_system_zone_cachep, entry);
}
}
@ -126,7 +136,7 @@ static void debug_print_tree(struct ext4_sb_info *sbi)
int first = 1;
printk(KERN_INFO "System zones: ");
node = rb_first(&sbi->system_blks);
node = rb_first(&sbi->system_blks->root);
while (node) {
entry = rb_entry(node, struct ext4_system_zone, node);
printk(KERN_CONT "%s%llu-%llu", first ? "" : ", ",
@ -137,7 +147,47 @@ static void debug_print_tree(struct ext4_sb_info *sbi)
printk(KERN_CONT "\n");
}
static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino)
/*
* Returns 1 if the passed-in block region (start_blk,
* start_blk+count) is valid; 0 if some part of the block region
* overlaps with filesystem metadata blocks.
*/
static int ext4_data_block_valid_rcu(struct ext4_sb_info *sbi,
struct ext4_system_blocks *system_blks,
ext4_fsblk_t start_blk,
unsigned int count)
{
struct ext4_system_zone *entry;
struct rb_node *n;
if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
(start_blk + count < start_blk) ||
(start_blk + count > ext4_blocks_count(sbi->s_es))) {
sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
return 0;
}
if (system_blks == NULL)
return 1;
n = system_blks->root.rb_node;
while (n) {
entry = rb_entry(n, struct ext4_system_zone, node);
if (start_blk + count - 1 < entry->start_blk)
n = n->rb_left;
else if (start_blk >= (entry->start_blk + entry->count))
n = n->rb_right;
else {
sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
return 0;
}
}
return 1;
}
static int ext4_protect_reserved_inode(struct super_block *sb,
struct ext4_system_blocks *system_blks,
u32 ino)
{
struct inode *inode;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@ -163,14 +213,15 @@ static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino)
if (n == 0) {
i++;
} else {
if (!ext4_data_block_valid(sbi, map.m_pblk, n)) {
if (!ext4_data_block_valid_rcu(sbi, system_blks,
map.m_pblk, n)) {
ext4_error(sb, "blocks %llu-%llu from inode %u "
"overlap system zone", map.m_pblk,
map.m_pblk + map.m_len - 1, ino);
err = -EFSCORRUPTED;
break;
}
err = add_system_zone(sbi, map.m_pblk, n);
err = add_system_zone(system_blks, map.m_pblk, n);
if (err < 0)
break;
i += n;
@ -180,94 +231,130 @@ static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino)
return err;
}
static void ext4_destroy_system_zone(struct rcu_head *rcu)
{
struct ext4_system_blocks *system_blks;
system_blks = container_of(rcu, struct ext4_system_blocks, rcu);
release_system_zone(system_blks);
kfree(system_blks);
}
/*
* Build system zone rbtree which is used for block validity checking.
*
* The update of system_blks pointer in this function is protected by
* sb->s_umount semaphore. However we have to be careful as we can be
* racing with ext4_data_block_valid() calls reading system_blks rbtree
* protected only by RCU. That's why we first build the rbtree and then
* swap it in place.
*/
int ext4_setup_system_zone(struct super_block *sb)
{
ext4_group_t ngroups = ext4_get_groups_count(sb);
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_system_blocks *system_blks;
struct ext4_group_desc *gdp;
ext4_group_t i;
int flex_size = ext4_flex_bg_size(sbi);
int ret;
if (!test_opt(sb, BLOCK_VALIDITY)) {
if (sbi->system_blks.rb_node)
if (sbi->system_blks)
ext4_release_system_zone(sb);
return 0;
}
if (sbi->system_blks.rb_node)
if (sbi->system_blks)
return 0;
system_blks = kzalloc(sizeof(*system_blks), GFP_KERNEL);
if (!system_blks)
return -ENOMEM;
for (i=0; i < ngroups; i++) {
cond_resched();
if (ext4_bg_has_super(sb, i) &&
((i < 5) || ((i % flex_size) == 0)))
add_system_zone(sbi, ext4_group_first_block_no(sb, i),
add_system_zone(system_blks,
ext4_group_first_block_no(sb, i),
ext4_bg_num_gdb(sb, i) + 1);
gdp = ext4_get_group_desc(sb, i, NULL);
ret = add_system_zone(sbi, ext4_block_bitmap(sb, gdp), 1);
ret = add_system_zone(system_blks,
ext4_block_bitmap(sb, gdp), 1);
if (ret)
return ret;
ret = add_system_zone(sbi, ext4_inode_bitmap(sb, gdp), 1);
goto err;
ret = add_system_zone(system_blks,
ext4_inode_bitmap(sb, gdp), 1);
if (ret)
return ret;
ret = add_system_zone(sbi, ext4_inode_table(sb, gdp),
goto err;
ret = add_system_zone(system_blks,
ext4_inode_table(sb, gdp),
sbi->s_itb_per_group);
if (ret)
return ret;
goto err;
}
if (ext4_has_feature_journal(sb) && sbi->s_es->s_journal_inum) {
ret = ext4_protect_reserved_inode(sb,
ret = ext4_protect_reserved_inode(sb, system_blks,
le32_to_cpu(sbi->s_es->s_journal_inum));
if (ret)
return ret;
goto err;
}
/*
* System blks rbtree complete, announce it once to prevent racing
* with ext4_data_block_valid() accessing the rbtree at the same
* time.
*/
rcu_assign_pointer(sbi->system_blks, system_blks);
if (test_opt(sb, DEBUG))
debug_print_tree(sbi);
return 0;
}
/* Called when the filesystem is unmounted */
void ext4_release_system_zone(struct super_block *sb)
{
struct ext4_system_zone *entry, *n;
rbtree_postorder_for_each_entry_safe(entry, n,
&EXT4_SB(sb)->system_blks, node)
kmem_cache_free(ext4_system_zone_cachep, entry);
EXT4_SB(sb)->system_blks = RB_ROOT;
err:
release_system_zone(system_blks);
kfree(system_blks);
return ret;
}
/*
* Returns 1 if the passed-in block region (start_blk,
* start_blk+count) is valid; 0 if some part of the block region
* overlaps with filesystem metadata blocks.
* Called when the filesystem is unmounted or when remounting it with
* noblock_validity specified.
*
* The update of system_blks pointer in this function is protected by
* sb->s_umount semaphore. However we have to be careful as we can be
* racing with ext4_data_block_valid() calls reading system_blks rbtree
* protected only by RCU. So we first clear the system_blks pointer and
* then free the rbtree only after RCU grace period expires.
*/
void ext4_release_system_zone(struct super_block *sb)
{
struct ext4_system_blocks *system_blks;
system_blks = rcu_dereference_protected(EXT4_SB(sb)->system_blks,
lockdep_is_held(&sb->s_umount));
rcu_assign_pointer(EXT4_SB(sb)->system_blks, NULL);
if (system_blks)
call_rcu(&system_blks->rcu, ext4_destroy_system_zone);
}
int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk,
unsigned int count)
{
struct ext4_system_zone *entry;
struct rb_node *n = sbi->system_blks.rb_node;
struct ext4_system_blocks *system_blks;
int ret;
if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
(start_blk + count < start_blk) ||
(start_blk + count > ext4_blocks_count(sbi->s_es))) {
sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
return 0;
}
while (n) {
entry = rb_entry(n, struct ext4_system_zone, node);
if (start_blk + count - 1 < entry->start_blk)
n = n->rb_left;
else if (start_blk >= (entry->start_blk + entry->count))
n = n->rb_right;
else {
sbi->s_es->s_last_error_block = cpu_to_le64(start_blk);
return 0;
}
}
return 1;
/*
* Lock the system zone to prevent it being released concurrently
* when doing a remount which inverse current "[no]block_validity"
* mount option.
*/
rcu_read_lock();
system_blks = rcu_dereference(sbi->system_blks);
ret = ext4_data_block_valid_rcu(sbi, system_blks, start_blk,
count);
rcu_read_unlock();
return ret;
}
int ext4_check_blockref(const char *function, unsigned int line,

7
fs/ext4/dir.c
View File

@ -668,14 +668,15 @@ static int ext4_d_compare(const struct dentry *dentry, unsigned int len,
const char *str, const struct qstr *name)
{
struct qstr qstr = {.name = str, .len = len };
struct inode *inode = dentry->d_parent->d_inode;
if (!IS_CASEFOLDED(dentry->d_parent->d_inode)) {
if (!IS_CASEFOLDED(inode) || !EXT4_SB(inode->i_sb)->s_encoding) {
if (len != name->len)
return -1;
return memcmp(str, name->name, len);
}
return ext4_ci_compare(dentry->d_parent->d_inode, name, &qstr, false);
return ext4_ci_compare(inode, name, &qstr, false);
}
static int ext4_d_hash(const struct dentry *dentry, struct qstr *str)
@ -685,7 +686,7 @@ static int ext4_d_hash(const struct dentry *dentry, struct qstr *str)
unsigned char *norm;
int len, ret = 0;
if (!IS_CASEFOLDED(dentry->d_inode))
if (!IS_CASEFOLDED(dentry->d_inode) || !um)
return 0;
norm = kmalloc(PATH_MAX, GFP_ATOMIC);

64
fs/ext4/ext4.h
View File

@ -185,6 +185,14 @@ struct ext4_map_blocks {
unsigned int m_flags;
};
/*
* Block validity checking, system zone rbtree.
*/
struct ext4_system_blocks {
struct rb_root root;
struct rcu_head rcu;
};
/*
* Flags for ext4_io_end->flags
*/
@ -285,6 +293,9 @@ struct ext4_io_submit {
~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
/* Fill in the low bits to get the last block of the cluster */
#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
/* Get the cluster offset */
#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
@ -653,6 +664,10 @@ enum {
#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
/* ioctl codes 19--39 are reserved for fscrypt */
#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
@ -666,6 +681,16 @@ enum {
#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
/*
* Flags returned by EXT4_IOC_GETSTATE
*
* We only expose to userspace a subset of the state flags in
* i_state_flags
*/
#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
#define EXT4_STATE_FLAG_NEW 0x00000002
#define EXT4_STATE_FLAG_NEWENTRY 0x00000004
#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
@ -683,6 +708,12 @@ enum {
#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
#endif
/*
* Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
* It indicates that the entry in extent status cache is for a hole.
*/
#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
/* Max physical block we can address w/o extents */
#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
@ -812,21 +843,8 @@ static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
static inline void ext4_decode_extra_time(struct timespec64 *time,
__le32 extra)
{
if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
#if 1
/* Handle legacy encoding of pre-1970 dates with epoch
* bits 1,1. (This backwards compatibility may be removed
* at the discretion of the ext4 developers.)
*/
u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
extra_bits = 0;
time->tv_sec += extra_bits << 32;
#else
if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
#endif
}
time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
}
@ -1427,7 +1445,7 @@ struct ext4_sb_info {
int s_jquota_fmt; /* Format of quota to use */
#endif
unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
struct rb_root system_blks;
struct ext4_system_blocks __rcu *system_blks;
#ifdef EXTENTS_STATS
/* ext4 extents stats */
@ -3267,6 +3285,9 @@ extern int ext4_ext_check_inode(struct inode *inode);
extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
extern int ext4_get_es_cache(struct inode *inode,
struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
extern int ext4_ext_precache(struct inode *inode);
extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
@ -3359,6 +3380,19 @@ static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
extern const struct iomap_ops ext4_iomap_ops;
static inline int ext4_buffer_uptodate(struct buffer_head *bh)
{
/*
* If the buffer has the write error flag, we have failed
* to write out data in the block. In this case, we don't
* have to read the block because we may read the old data
* successfully.
*/
if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
set_buffer_uptodate(bh);
return buffer_uptodate(bh);
}
#endif /* __KERNEL__ */
#define EFSBADCRC EBADMSG /* Bad CRC detected */

98
fs/ext4/extents.c
View File

@ -2315,6 +2315,52 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
return err;
}
static int ext4_fill_es_cache_info(struct inode *inode,
ext4_lblk_t block, ext4_lblk_t num,
struct fiemap_extent_info *fieinfo)
{
ext4_lblk_t next, end = block + num - 1;
struct extent_status es;
unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
unsigned int flags;
int err;
while (block <= end) {
next = 0;
flags = 0;
if (!ext4_es_lookup_extent(inode, block, &next, &es))
break;
if (ext4_es_is_unwritten(&es))
flags |= FIEMAP_EXTENT_UNWRITTEN;
if (ext4_es_is_delayed(&es))
flags |= (FIEMAP_EXTENT_DELALLOC |
FIEMAP_EXTENT_UNKNOWN);
if (ext4_es_is_hole(&es))
flags |= EXT4_FIEMAP_EXTENT_HOLE;
if (next == 0)
flags |= FIEMAP_EXTENT_LAST;
if (flags & (FIEMAP_EXTENT_DELALLOC|
EXT4_FIEMAP_EXTENT_HOLE))
es.es_pblk = 0;
else
es.es_pblk = ext4_es_pblock(&es);
err = fiemap_fill_next_extent(fieinfo,
(__u64)es.es_lblk << blksize_bits,
(__u64)es.es_pblk << blksize_bits,
(__u64)es.es_len << blksize_bits,
flags);
if (next == 0)
break;
block = next;
if (err < 0)
return err;
if (err == 1)
return 0;
}
return 0;
}
/*
* ext4_ext_determine_hole - determine hole around given block
* @inode: inode we lookup in
@ -3813,8 +3859,8 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
* illegal.
*/
if (ee_block != map->m_lblk || ee_len > map->m_len) {
#ifdef EXT4_DEBUG
ext4_warning("Inode (%ld) finished: extent logical block %llu,"
#ifdef CONFIG_EXT4_DEBUG
ext4_warning(inode->i_sb, "Inode (%ld) finished: extent logical block %llu,"
" len %u; IO logical block %llu, len %u",
inode->i_ino, (unsigned long long)ee_block, ee_len,
(unsigned long long)map->m_lblk, map->m_len);
@ -5017,8 +5063,6 @@ static int ext4_find_delayed_extent(struct inode *inode,
return next_del;
}
/* fiemap flags we can handle specified here */
#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
static int ext4_xattr_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo)
@ -5055,10 +5099,16 @@ static int ext4_xattr_fiemap(struct inode *inode,
return (error < 0 ? error : 0);
}
int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
static int _ext4_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len,
int (*fill)(struct inode *, ext4_lblk_t,
ext4_lblk_t,
struct fiemap_extent_info *))
{
ext4_lblk_t start_blk;
u32 ext4_fiemap_flags = FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR;
int error = 0;
if (ext4_has_inline_data(inode)) {
@ -5075,14 +5125,18 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
error = ext4_ext_precache(inode);
if (error)
return error;
fieinfo->fi_flags &= ~FIEMAP_FLAG_CACHE;
}
/* fallback to generic here if not in extents fmt */
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) &&
fill == ext4_fill_fiemap_extents)
return generic_block_fiemap(inode, fieinfo, start, len,
ext4_get_block);
if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
if (fill == ext4_fill_es_cache_info)
ext4_fiemap_flags &= FIEMAP_FLAG_XATTR;
if (fiemap_check_flags(fieinfo, ext4_fiemap_flags))
return -EBADR;
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
@ -5101,12 +5155,36 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
* Walk the extent tree gathering extent information
* and pushing extents back to the user.
*/
error = ext4_fill_fiemap_extents(inode, start_blk,
len_blks, fieinfo);
error = fill(inode, start_blk, len_blks, fieinfo);
}
return error;
}
int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
{
return _ext4_fiemap(inode, fieinfo, start, len,
ext4_fill_fiemap_extents);
}
int ext4_get_es_cache(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
{
if (ext4_has_inline_data(inode)) {
int has_inline;
down_read(&EXT4_I(inode)->xattr_sem);
has_inline = ext4_has_inline_data(inode);
up_read(&EXT4_I(inode)->xattr_sem);
if (has_inline)
return 0;
}
return _ext4_fiemap(inode, fieinfo, start, len,
ext4_fill_es_cache_info);
}
/*
* ext4_access_path:
* Function to access the path buffer for marking it dirty.

521
fs/ext4/extents_status.c
View File

@ -146,7 +146,7 @@ static struct kmem_cache *ext4_pending_cachep;
static int __es_insert_extent(struct inode *inode, struct extent_status *newes);
static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t end);
ext4_lblk_t end, int *reserved);
static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan);
static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan,
struct ext4_inode_info *locked_ei);
@ -836,7 +836,7 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_es_insert_extent_check(inode, &newes);
write_lock(&EXT4_I(inode)->i_es_lock);
err = __es_remove_extent(inode, lblk, end);
err = __es_remove_extent(inode, lblk, end, NULL);
if (err != 0)
goto error;
retry:
@ -899,6 +899,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
* Return: 1 on found, 0 on not
*/
int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t *next_lblk,
struct extent_status *es)
{
struct ext4_es_tree *tree;
@ -947,9 +948,18 @@ out:
es->es_pblk = es1->es_pblk;
if (!ext4_es_is_referenced(es1))
ext4_es_set_referenced(es1);
stats->es_stats_cache_hits++;
percpu_counter_inc(&stats->es_stats_cache_hits);
if (next_lblk) {
node = rb_next(&es1->rb_node);
if (node) {
es1 = rb_entry(node, struct extent_status,
rb_node);
*next_lblk = es1->es_lblk;
} else
*next_lblk = 0;
}
} else {
stats->es_stats_cache_misses++;
percpu_counter_inc(&stats->es_stats_cache_misses);
}
read_unlock(&EXT4_I(inode)->i_es_lock);
@ -958,8 +968,322 @@ out:
return found;
}
struct rsvd_count {
int ndelonly;
bool first_do_lblk_found;
ext4_lblk_t first_do_lblk;
ext4_lblk_t last_do_lblk;
struct extent_status *left_es;
bool partial;
ext4_lblk_t lclu;
};
/*
* init_rsvd - initialize reserved count data before removing block range
* in file from extent status tree
*
* @inode - file containing range
* @lblk - first block in range
* @es - pointer to first extent in range
* @rc - pointer to reserved count data
*
* Assumes es is not NULL
*/
static void init_rsvd(struct inode *inode, ext4_lblk_t lblk,
struct extent_status *es, struct rsvd_count *rc)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct rb_node *node;
rc->ndelonly = 0;
/*
* for bigalloc, note the first delonly block in the range has not
* been found, record the extent containing the block to the left of
* the region to be removed, if any, and note that there's no partial
* cluster to track
*/
if (sbi->s_cluster_ratio > 1) {
rc->first_do_lblk_found = false;
if (lblk > es->es_lblk) {
rc->left_es = es;
} else {
node = rb_prev(&es->rb_node);
rc->left_es = node ? rb_entry(node,
struct extent_status,
rb_node) : NULL;
}
rc->partial = false;
}
}
/*
* count_rsvd - count the clusters containing delayed and not unwritten
* (delonly) blocks in a range within an extent and add to
* the running tally in rsvd_count
*
* @inode - file containing extent
* @lblk - first block in range
* @len - length of range in blocks
* @es - pointer to extent containing clusters to be counted
* @rc - pointer to reserved count data
*
* Tracks partial clusters found at the beginning and end of extents so
* they aren't overcounted when they span adjacent extents
*/
static void count_rsvd(struct inode *inode, ext4_lblk_t lblk, long len,
struct extent_status *es, struct rsvd_count *rc)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
ext4_lblk_t i, end, nclu;
if (!ext4_es_is_delonly(es))
return;
WARN_ON(len <= 0);
if (sbi->s_cluster_ratio == 1) {
rc->ndelonly += (int) len;
return;
}
/* bigalloc */
i = (lblk < es->es_lblk) ? es->es_lblk : lblk;
end = lblk + (ext4_lblk_t) len - 1;
end = (end > ext4_es_end(es)) ? ext4_es_end(es) : end;
/* record the first block of the first delonly extent seen */
if (rc->first_do_lblk_found == false) {
rc->first_do_lblk = i;
rc->first_do_lblk_found = true;
}
/* update the last lblk in the region seen so far */
rc->last_do_lblk = end;
/*
* if we're tracking a partial cluster and the current extent
* doesn't start with it, count it and stop tracking
*/
if (rc->partial && (rc->lclu != EXT4_B2C(sbi, i))) {
rc->ndelonly++;
rc->partial = false;
}
/*
* if the first cluster doesn't start on a cluster boundary but
* ends on one, count it
*/
if (EXT4_LBLK_COFF(sbi, i) != 0) {
if (end >= EXT4_LBLK_CFILL(sbi, i)) {
rc->ndelonly++;
rc->partial = false;
i = EXT4_LBLK_CFILL(sbi, i) + 1;
}
}
/*
* if the current cluster starts on a cluster boundary, count the
* number of whole delonly clusters in the extent
*/
if ((i + sbi->s_cluster_ratio - 1) <= end) {
nclu = (end - i + 1) >> sbi->s_cluster_bits;
rc->ndelonly += nclu;
i += nclu << sbi->s_cluster_bits;
}
/*
* start tracking a partial cluster if there's a partial at the end
* of the current extent and we're not already tracking one
*/
if (!rc->partial && i <= end) {
rc->partial = true;
rc->lclu = EXT4_B2C(sbi, i);
}
}
/*
* __pr_tree_search - search for a pending cluster reservation
*
* @root - root of pending reservation tree
* @lclu - logical cluster to search for
*
* Returns the pending reservation for the cluster identified by @lclu
* if found. If not, returns a reservation for the next cluster if any,
* and if not, returns NULL.
*/
static struct pending_reservation *__pr_tree_search(struct rb_root *root,
ext4_lblk_t lclu)
{
struct rb_node *node = root->rb_node;
struct pending_reservation *pr = NULL;
while (node) {
pr = rb_entry(node, struct pending_reservation, rb_node);
if (lclu < pr->lclu)
node = node->rb_left;
else if (lclu > pr->lclu)
node = node->rb_right;
else
return pr;
}
if (pr && lclu < pr->lclu)
return pr;
if (pr && lclu > pr->lclu) {
node = rb_next(&pr->rb_node);
return node ? rb_entry(node, struct pending_reservation,
rb_node) : NULL;
}
return NULL;
}
/*
* get_rsvd - calculates and returns the number of cluster reservations to be
* released when removing a block range from the extent status tree
* and releases any pending reservations within the range
*
* @inode - file containing block range
* @end - last block in range
* @right_es - pointer to extent containing next block beyond end or NULL
* @rc - pointer to reserved count data
*
* The number of reservations to be released is equal to the number of
* clusters containing delayed and not unwritten (delonly) blocks within
* the range, minus the number of clusters still containing delonly blocks
* at the ends of the range, and minus the number of pending reservations
* within the range.
*/
static unsigned int get_rsvd(struct inode *inode, ext4_lblk_t end,
struct extent_status *right_es,
struct rsvd_count *rc)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct pending_reservation *pr;
struct ext4_pending_tree *tree = &EXT4_I(inode)->i_pending_tree;
struct rb_node *node;
ext4_lblk_t first_lclu, last_lclu;
bool left_delonly, right_delonly, count_pending;
struct extent_status *es;
if (sbi->s_cluster_ratio > 1) {
/* count any remaining partial cluster */
if (rc->partial)
rc->ndelonly++;
if (rc->ndelonly == 0)
return 0;
first_lclu = EXT4_B2C(sbi, rc->first_do_lblk);
last_lclu = EXT4_B2C(sbi, rc->last_do_lblk);
/*
* decrease the delonly count by the number of clusters at the
* ends of the range that still contain delonly blocks -
* these clusters still need to be reserved
*/
left_delonly = right_delonly = false;
es = rc->left_es;
while (es && ext4_es_end(es) >=
EXT4_LBLK_CMASK(sbi, rc->first_do_lblk)) {
if (ext4_es_is_delonly(es)) {
rc->ndelonly--;
left_delonly = true;
break;
}
node = rb_prev(&es->rb_node);
if (!node)
break;
es = rb_entry(node, struct extent_status, rb_node);
}
if (right_es && (!left_delonly || first_lclu != last_lclu)) {
if (end < ext4_es_end(right_es)) {
es = right_es;
} else {
node = rb_next(&right_es->rb_node);
es = node ? rb_entry(node, struct extent_status,
rb_node) : NULL;
}
while (es && es->es_lblk <=
EXT4_LBLK_CFILL(sbi, rc->last_do_lblk)) {
if (ext4_es_is_delonly(es)) {
rc->ndelonly--;
right_delonly = true;
break;
}
node = rb_next(&es->rb_node);
if (!node)
break;
es = rb_entry(node, struct extent_status,
rb_node);
}
}
/*
* Determine the block range that should be searched for
* pending reservations, if any. Clusters on the ends of the
* original removed range containing delonly blocks are
* excluded. They've already been accounted for and it's not
* possible to determine if an associated pending reservation
* should be released with the information available in the
* extents status tree.
*/
if (first_lclu == last_lclu) {
if (left_delonly | right_delonly)
count_pending = false;
else
count_pending = true;
} else {
if (left_delonly)
first_lclu++;
if (right_delonly)
last_lclu--;
if (first_lclu <= last_lclu)
count_pending = true;
else
count_pending = false;
}
/*
* a pending reservation found between first_lclu and last_lclu
* represents an allocated cluster that contained at least one
* delonly block, so the delonly total must be reduced by one
* for each pending reservation found and released
*/
if (count_pending) {
pr = __pr_tree_search(&tree->root, first_lclu);
while (pr && pr->lclu <= last_lclu) {
rc->ndelonly--;
node = rb_next(&pr->rb_node);
rb_erase(&pr->rb_node, &tree->root);
kmem_cache_free(ext4_pending_cachep, pr);
if (!node)
break;
pr = rb_entry(node, struct pending_reservation,
rb_node);
}
}
}
return rc->ndelonly;
}
/*
* __es_remove_extent - removes block range from extent status tree
*
* @inode - file containing range
* @lblk - first block in range
* @end - last block in range
* @reserved - number of cluster reservations released
*
* If @reserved is not NULL and delayed allocation is enabled, counts
* block/cluster reservations freed by removing range and if bigalloc
* enabled cancels pending reservations as needed. Returns 0 on success,
* error code on failure.
*/
static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t end)
ext4_lblk_t end, int *reserved)
{
struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
struct rb_node *node;
@ -968,9 +1292,14 @@ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len1, len2;
ext4_fsblk_t block;
int err;
bool count_reserved = true;
struct rsvd_count rc;
if (reserved == NULL || !test_opt(inode->i_sb, DELALLOC))
count_reserved = false;
retry:
err = 0;
es = __es_tree_search(&tree->root, lblk);
if (!es)
goto out;
@ -979,6 +1308,8 @@ retry:
/* Simply invalidate cache_es. */
tree->cache_es = NULL;
if (count_reserved)
init_rsvd(inode, lblk, es, &rc);
orig_es.es_lblk = es->es_lblk;
orig_es.es_len = es->es_len;
@ -1020,10 +1351,16 @@ retry:
ext4_es_store_pblock(es, block);
}
}
if (count_reserved)
count_rsvd(inode, lblk, orig_es.es_len - len1 - len2,
&orig_es, &rc);
goto out;
}
if (len1 > 0) {
if (count_reserved)
count_rsvd(inode, lblk, orig_es.es_len - len1,
&orig_es, &rc);
node = rb_next(&es->rb_node);
if (node)
es = rb_entry(node, struct extent_status, rb_node);
@ -1032,6 +1369,8 @@ retry:
}
while (es && ext4_es_end(es) <= end) {
if (count_reserved)
count_rsvd(inode, es->es_lblk, es->es_len, es, &rc);
node = rb_next(&es->rb_node);
rb_erase(&es->rb_node, &tree->root);
ext4_es_free_extent(inode, es);
@ -1046,6 +1385,9 @@ retry:
ext4_lblk_t orig_len = es->es_len;
len1 = ext4_es_end(es) - end;
if (count_reserved)
count_rsvd(inode, es->es_lblk, orig_len - len1,
es, &rc);
es->es_lblk = end + 1;
es->es_len = len1;
if (ext4_es_is_written(es) || ext4_es_is_unwritten(es)) {
@ -1054,20 +1396,28 @@ retry:
}
}
if (count_reserved)
*reserved = get_rsvd(inode, end, es, &rc);
out:
return err;
}
/*
* ext4_es_remove_extent() removes a space from a extent status tree.
* ext4_es_remove_extent - removes block range from extent status tree
*
* Return 0 on success, error code on failure.
* @inode - file containing range
* @lblk - first block in range
* @len - number of blocks to remove
*
* Reduces block/cluster reservation count and for bigalloc cancels pending
* reservations as needed. Returns 0 on success, error code on failure.
*/
int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len)
{
ext4_lblk_t end;
int err = 0;
int reserved = 0;
trace_ext4_es_remove_extent(inode, lblk, len);
es_debug("remove [%u/%u) from extent status tree of inode %lu\n",
@ -1085,9 +1435,10 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
* is reclaimed.
*/
write_lock(&EXT4_I(inode)->i_es_lock);
err = __es_remove_extent(inode, lblk, end);
err = __es_remove_extent(inode, lblk, end, &reserved);
write_unlock(&EXT4_I(inode)->i_es_lock);
ext4_es_print_tree(inode);
ext4_da_release_space(inode, reserved);
return err;
}
@ -1235,9 +1586,9 @@ int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v)
seq_printf(seq, "stats:\n %lld objects\n %lld reclaimable objects\n",
percpu_counter_sum_positive(&es_stats->es_stats_all_cnt),
percpu_counter_sum_positive(&es_stats->es_stats_shk_cnt));
seq_printf(seq, " %lu/%lu cache hits/misses\n",
es_stats->es_stats_cache_hits,
es_stats->es_stats_cache_misses);
seq_printf(seq, " %lld/%lld cache hits/misses\n",
percpu_counter_sum_positive(&es_stats->es_stats_cache_hits),
percpu_counter_sum_positive(&es_stats->es_stats_cache_misses));
if (inode_cnt)
seq_printf(seq, " %d inodes on list\n", inode_cnt);
@ -1264,35 +1615,46 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
sbi->s_es_nr_inode = 0;
spin_lock_init(&sbi->s_es_lock);
sbi->s_es_stats.es_stats_shrunk = 0;
sbi->s_es_stats.es_stats_cache_hits = 0;
sbi->s_es_stats.es_stats_cache_misses = 0;
err = percpu_counter_init(&sbi->s_es_stats.es_stats_cache_hits, 0,
GFP_KERNEL);
if (err)
return err;
err = percpu_counter_init(&sbi->s_es_stats.es_stats_cache_misses, 0,
GFP_KERNEL);
if (err)
goto err1;
sbi->s_es_stats.es_stats_scan_time = 0;
sbi->s_es_stats.es_stats_max_scan_time = 0;
err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0, GFP_KERNEL);
if (err)
return err;
goto err2;
err = percpu_counter_init(&sbi->s_es_stats.es_stats_shk_cnt, 0, GFP_KERNEL);
if (err)
goto err1;
goto err3;
sbi->s_es_shrinker.scan_objects = ext4_es_scan;
sbi->s_es_shrinker.count_objects = ext4_es_count;
sbi->s_es_shrinker.seeks = DEFAULT_SEEKS;
err = register_shrinker(&sbi->s_es_shrinker);
if (err)
goto err2;
goto err4;
return 0;
err2:
err4:
percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt);
err1:
err3:
percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
err2:
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses);
err1:
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_hits);
return err;
}
void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi)
{
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_hits);
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses);
percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt);
unregister_shrinker(&sbi->s_es_shrinker);
@ -1317,6 +1679,7 @@ static int es_do_reclaim_extents(struct ext4_inode_info *ei, ext4_lblk_t end,
es = __es_tree_search(&tree->root, ei->i_es_shrink_lblk);
if (!es)
goto out_wrap;
while (*nr_to_scan > 0) {
if (es->es_lblk > end) {
ei->i_es_shrink_lblk = end + 1;
@ -1374,6 +1737,34 @@ static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan)
return nr_shrunk;
}
/*
* Called to support EXT4_IOC_CLEAR_ES_CACHE. We can only remove
* discretionary entries from the extent status cache. (Some entries
* must be present for proper operations.)
*/
void ext4_clear_inode_es(struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
struct extent_status *es;
struct ext4_es_tree *tree;
struct rb_node *node;
write_lock(&ei->i_es_lock);
tree = &EXT4_I(inode)->i_es_tree;
tree->cache_es = NULL;
node = rb_first(&tree->root);
while (node) {
es = rb_entry(node, struct extent_status, rb_node);
node = rb_next(node);
if (!ext4_es_is_delayed(es)) {
rb_erase(&es->rb_node, &tree->root);
ext4_es_free_extent(inode, es);
}
}
ext4_clear_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
write_unlock(&ei->i_es_lock);
}
#ifdef ES_DEBUG__
static void ext4_print_pending_tree(struct inode *inode)
{
@ -1590,7 +1981,7 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
write_lock(&EXT4_I(inode)->i_es_lock);
err = __es_remove_extent(inode, lblk, lblk);
err = __es_remove_extent(inode, lblk, lblk, NULL);
if (err != 0)
goto error;
retry:
@ -1779,93 +2170,3 @@ static void __revise_pending(struct inode *inode, ext4_lblk_t lblk,
__remove_pending(inode, last);
}
}
/*
* ext4_es_remove_blks - remove block range from extents status tree and
* reduce reservation count or cancel pending
* reservation as needed
*
* @inode - file containing range
* @lblk - first block in range
* @len - number of blocks to remove
*
*/
void ext4_es_remove_blks(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
unsigned int clu_size, reserved = 0;
ext4_lblk_t last_lclu, first, length, remainder, last;
bool delonly;
int err = 0;
struct pending_reservation *pr;
struct ext4_pending_tree *tree;
/*
* Process cluster by cluster for bigalloc - there may be up to
* two clusters in a 4k page with a 1k block size and two blocks
* per cluster. Also necessary for systems with larger page sizes
* and potentially larger block sizes.
*/
clu_size = sbi->s_cluster_ratio;
last_lclu = EXT4_B2C(sbi, lblk + len - 1);
write_lock(&EXT4_I(inode)->i_es_lock);
for (first = lblk, remainder = len;
remainder > 0;
first += length, remainder -= length) {
if (EXT4_B2C(sbi, first) == last_lclu)
length = remainder;
else
length = clu_size - EXT4_LBLK_COFF(sbi, first);
/*
* The BH_Delay flag, which triggers calls to this function,
* and the contents of the extents status tree can be
* inconsistent due to writepages activity. So, note whether
* the blocks to be removed actually belong to an extent with
* delayed only status.
*/
delonly = __es_scan_clu(inode, &ext4_es_is_delonly, first);
/*
* because of the writepages effect, written and unwritten
* blocks could be removed here
*/
last = first + length - 1;
err = __es_remove_extent(inode, first, last);
if (err)
ext4_warning(inode->i_sb,
"%s: couldn't remove page (err = %d)",
__func__, err);
/* non-bigalloc case: simply count the cluster for release */
if (sbi->s_cluster_ratio == 1 && delonly) {
reserved++;
continue;
}
/*
* bigalloc case: if all delayed allocated only blocks have
* just been removed from a cluster, either cancel a pending
* reservation if it exists or count a cluster for release
*/
if (delonly &&
!__es_scan_clu(inode, &ext4_es_is_delonly, first)) {
pr = __get_pending(inode, EXT4_B2C(sbi, first));
if (pr != NULL) {
tree = &EXT4_I(inode)->i_pending_tree;
rb_erase(&pr->rb_node, &tree->root);
kmem_cache_free(ext4_pending_cachep, pr);
} else {
reserved++;
}
}
}
write_unlock(&EXT4_I(inode)->i_es_lock);
ext4_da_release_space(inode, reserved);
}

8
fs/ext4/extents_status.h
View File

@ -70,8 +70,8 @@ struct ext4_es_tree {
struct ext4_es_stats {
unsigned long es_stats_shrunk;
unsigned long es_stats_cache_hits;
unsigned long es_stats_cache_misses;
struct percpu_counter es_stats_cache_hits;
struct percpu_counter es_stats_cache_misses;
u64 es_stats_scan_time;
u64 es_stats_max_scan_time;
struct percpu_counter es_stats_all_cnt;
@ -140,6 +140,7 @@ extern void ext4_es_find_extent_range(struct inode *inode,
ext4_lblk_t lblk, ext4_lblk_t end,
struct extent_status *es);
extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t *next_lblk,
struct extent_status *es);
extern bool ext4_es_scan_range(struct inode *inode,
int (*matching_fn)(struct extent_status *es),
@ -246,7 +247,6 @@ extern int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
bool allocated);
extern unsigned int ext4_es_delayed_clu(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern void ext4_es_remove_blks(struct inode *inode, ext4_lblk_t lblk,
ext4_lblk_t len);
extern void ext4_clear_inode_es(struct inode *inode);
#endif /* _EXT4_EXTENTS_STATUS_H */

2
fs/ext4/file.c
View File

@ -230,8 +230,6 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (IS_DAX(inode))
return ext4_dax_write_iter(iocb, from);
#endif
if (!o_direct && (iocb->ki_flags & IOCB_NOWAIT))
return -EOPNOTSUPP;
if (!inode_trylock(inode)) {
if (iocb->ki_flags & IOCB_NOWAIT)

2
fs/ext4/hash.c
View File

@ -280,7 +280,7 @@ int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
unsigned char *buff;
struct qstr qstr = {.name = name, .len = len };
if (len && IS_CASEFOLDED(dir)) {
if (len && IS_CASEFOLDED(dir) && um) {
buff = kzalloc(sizeof(char) * PATH_MAX, GFP_KERNEL);
if (!buff)
return -ENOMEM;

2
fs/ext4/inline.c
View File

@ -1416,7 +1416,7 @@ int ext4_inlinedir_to_tree(struct file *dir_file,
err = ext4_htree_store_dirent(dir_file, hinfo->hash,
hinfo->minor_hash, de, &tmp_str);
if (err) {
count = err;
ret = err;
goto out;
}
count++;

103
fs/ext4/inode.c
View File

@ -527,7 +527,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
return -EFSCORRUPTED;
/* Lookup extent status tree firstly */
if (ext4_es_lookup_extent(inode, map->m_lblk, &es)) {
if (ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es)) {
if (ext4_es_is_written(&es) || ext4_es_is_unwritten(&es)) {
map->m_pblk = ext4_es_pblock(&es) +
map->m_lblk - es.es_lblk;
@ -695,7 +695,7 @@ found:
* extent status tree.
*/
if ((flags & EXT4_GET_BLOCKS_PRE_IO) &&
ext4_es_lookup_extent(inode, map->m_lblk, &es)) {
ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es)) {
if (ext4_es_is_written(&es))
goto out_sem;
}
@ -1024,7 +1024,7 @@ struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
if (!bh || buffer_uptodate(bh))
if (!bh || ext4_buffer_uptodate(bh))
return bh;
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
wait_on_buffer(bh);
@ -1051,7 +1051,7 @@ int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
for (i = 0; i < bh_count; i++)
/* Note that NULL bhs[i] is valid because of holes. */
if (bhs[i] && !buffer_uptodate(bhs[i]))
if (bhs[i] && !ext4_buffer_uptodate(bhs[i]))
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1,
&bhs[i]);
@ -1656,49 +1656,6 @@ void ext4_da_release_space(struct inode *inode, int to_free)
dquot_release_reservation_block(inode, EXT4_C2B(sbi, to_free));
}
static void ext4_da_page_release_reservation(struct page *page,
unsigned int offset,
unsigned int length)
{
int contiguous_blks = 0;
struct buffer_head *head, *bh;
unsigned int curr_off = 0;
struct inode *inode = page->mapping->host;
unsigned int stop = offset + length;
ext4_fsblk_t lblk;
BUG_ON(stop > PAGE_SIZE || stop < length);
head = page_buffers(page);
bh = head;
do {
unsigned int next_off = curr_off + bh->b_size;
if (next_off > stop)
break;
if ((offset <= curr_off) && (buffer_delay(bh))) {
contiguous_blks++;
clear_buffer_delay(bh);
} else if (contiguous_blks) {
lblk = page->index <<
(PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) -
contiguous_blks;
ext4_es_remove_blks(inode, lblk, contiguous_blks);
contiguous_blks = 0;
}
curr_off = next_off;
} while ((bh = bh->b_this_page) != head);
if (contiguous_blks) {
lblk = page->index << (PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) - contiguous_blks;
ext4_es_remove_blks(inode, lblk, contiguous_blks);
}
}
/*
* Delayed allocation stuff
*/
@ -1878,7 +1835,7 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock,
(unsigned long) map->m_lblk);
/* Lookup extent status tree firstly */
if (ext4_es_lookup_extent(inode, iblock, &es)) {
if (ext4_es_lookup_extent(inode, iblock, NULL, &es)) {
if (ext4_es_is_hole(&es)) {
retval = 0;
down_read(&EXT4_I(inode)->i_data_sem);
@ -2800,15 +2757,6 @@ static int ext4_writepages(struct address_space *mapping,
goto out_writepages;
}
if (ext4_should_dioread_nolock(inode)) {
/*
* We may need to convert up to one extent per block in
* the page and we may dirty the inode.
*/
rsv_blocks = 1 + ext4_chunk_trans_blocks(inode,
PAGE_SIZE >> inode->i_blkbits);
}
/*
* If we have inline data and arrive here, it means that
* we will soon create the block for the 1st page, so
@ -2827,6 +2775,15 @@ static int ext4_writepages(struct address_space *mapping,
ext4_journal_stop(handle);
}
if (ext4_should_dioread_nolock(inode)) {
/*
* We may need to convert up to one extent per block in
* the page and we may dirty the inode.
*/
rsv_blocks = 1 + ext4_chunk_trans_blocks(inode,
PAGE_SIZE >> inode->i_blkbits);
}
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1;
@ -3242,24 +3199,6 @@ static int ext4_da_write_end(struct file *file,
return ret ? ret : copied;
}
static void ext4_da_invalidatepage(struct page *page, unsigned int offset,
unsigned int length)
{
/*
* Drop reserved blocks
*/
BUG_ON(!PageLocked(page));
if (!page_has_buffers(page))
goto out;
ext4_da_page_release_reservation(page, offset, length);
out:
ext4_invalidatepage(page, offset, length);
return;
}
/*
* Force all delayed allocation blocks to be allocated for a given inode.
*/
@ -4002,7 +3941,7 @@ static const struct address_space_operations ext4_da_aops = {
.write_end = ext4_da_write_end,
.set_page_dirty = ext4_set_page_dirty,
.bmap = ext4_bmap,
.invalidatepage = ext4_da_invalidatepage,
.invalidatepage = ext4_invalidatepage,
.releasepage = ext4_releasepage,
.direct_IO = ext4_direct_IO,
.migratepage = buffer_migrate_page,
@ -4314,6 +4253,15 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
trace_ext4_punch_hole(inode, offset, length, 0);
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
if (ext4_has_inline_data(inode)) {
down_write(&EXT4_I(inode)->i_mmap_sem);
ret = ext4_convert_inline_data(inode);
up_write(&EXT4_I(inode)->i_mmap_sem);
if (ret)
return ret;
}
/*
* Write out all dirty pages to avoid race conditions
* Then release them.
@ -5137,6 +5085,9 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
"iget: bogus i_mode (%o)", inode->i_mode);
goto bad_inode;
}
if (IS_CASEFOLDED(inode) && !ext4_has_feature_casefold(inode->i_sb))
ext4_error_inode(inode, function, line, 0,
"casefold flag without casefold feature");
brelse(iloc.bh);
unlock_new_inode(inode);

98
fs/ext4/ioctl.c
View File

@ -745,6 +745,74 @@ static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
}
/* copied from fs/ioctl.c */
static int fiemap_check_ranges(struct super_block *sb,
u64 start, u64 len, u64 *new_len)
{
u64 maxbytes = (u64) sb->s_maxbytes;
*new_len = len;
if (len == 0)
return -EINVAL;
if (start > maxbytes)
return -EFBIG;
/*
* Shrink request scope to what the fs can actually handle.
*/
if (len > maxbytes || (maxbytes - len) < start)
*new_len = maxbytes - start;
return 0;
}
/* So that the fiemap access checks can't overflow on 32 bit machines. */
#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
{
struct fiemap fiemap;
struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
struct fiemap_extent_info fieinfo = { 0, };
struct inode *inode = file_inode(filp);
struct super_block *sb = inode->i_sb;
u64 len;
int error;
if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
return -EFAULT;
if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
return -EINVAL;
error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
&len);
if (error)
return error;
fieinfo.fi_flags = fiemap.fm_flags;
fieinfo.fi_extents_max = fiemap.fm_extent_count;
fieinfo.fi_extents_start = ufiemap->fm_extents;
if (fiemap.fm_extent_count != 0 &&
!access_ok(fieinfo.fi_extents_start,
fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
return -EFAULT;
if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
filemap_write_and_wait(inode->i_mapping);
error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start, len);
fiemap.fm_flags = fieinfo.fi_flags;
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
error = -EFAULT;
return error;
}
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@ -1142,6 +1210,33 @@ resizefs_out:
return -EOPNOTSUPP;
return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
case EXT4_IOC_CLEAR_ES_CACHE:
{
if (!inode_owner_or_capable(inode))
return -EACCES;
ext4_clear_inode_es(inode);
return 0;
}
case EXT4_IOC_GETSTATE:
{
__u32 state = 0;
if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
state |= EXT4_STATE_FLAG_EXT_PRECACHED;
if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
state |= EXT4_STATE_FLAG_NEW;
if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
state |= EXT4_STATE_FLAG_NEWENTRY;
if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
return put_user(state, (__u32 __user *) arg);
}
case EXT4_IOC_GET_ES_CACHE:
return ext4_ioctl_get_es_cache(filp, arg);
case EXT4_IOC_FSGETXATTR:
{
struct fsxattr fa;
@ -1278,6 +1373,9 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FS_IOC_GETFSMAP:
case FS_IOC_ENABLE_VERITY:
case FS_IOC_MEASURE_VERITY:
case EXT4_IOC_CLEAR_ES_CACHE:
case EXT4_IOC_GETSTATE:
case EXT4_IOC_GET_ES_CACHE:
break;
default:
return -ENOIOCTLCMD;

4
fs/ext4/namei.c
View File

@ -1312,7 +1312,7 @@ void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
{
int len;
if (!IS_CASEFOLDED(dir)) {
if (!IS_CASEFOLDED(dir) || !EXT4_SB(dir->i_sb)->s_encoding) {
cf_name->name = NULL;
return;
}
@ -2183,7 +2183,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
#ifdef CONFIG_UNICODE
if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
utf8_validate(sbi->s_encoding, &dentry->d_name))
sbi->s_encoding && utf8_validate(sbi->s_encoding, &dentry->d_name))
return -EINVAL;
#endif

7
fs/ext4/super.c
View File

@ -1878,6 +1878,13 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
} else if (token == Opt_commit) {
if (arg == 0)
arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
else if (arg > INT_MAX / HZ) {
ext4_msg(sb, KERN_ERR,
"Invalid commit interval %d, "
"must be smaller than %d",
arg, INT_MAX / HZ);
return -1;
}
sbi->s_commit_interval = HZ * arg;
} else if (token == Opt_debug_want_extra_isize) {
sbi->s_want_extra_isize = arg;

4
fs/jbd2/revoke.c
View File

@ -638,10 +638,8 @@ static void flush_descriptor(journal_t *journal,
{
jbd2_journal_revoke_header_t *header;
if (is_journal_aborted(journal)) {
put_bh(descriptor);
if (is_journal_aborted(journal))
return;
}
header = (jbd2_journal_revoke_header_t *)descriptor->b_data;
header->r_count = cpu_to_be32(offset);

3
fs/jbd2/transaction.c
View File

@ -569,6 +569,9 @@ int jbd2_journal_start_reserved(handle_t *handle, unsigned int type,
}
handle->h_type = type;
handle->h_line_no = line_no;
trace_jbd2_handle_start(journal->j_fs_dev->bd_dev,
handle->h_transaction->t_tid, type,
line_no, handle->h_buffer_credits);
return 0;
}
EXPORT_SYMBOL(jbd2_journal_start_reserved);

2
fs/unicode/utf8-core.c
View File

@ -154,7 +154,7 @@ static int utf8_parse_version(const char *version, unsigned int *maj,
{
substring_t args[3];
char version_string[12];
const struct match_token token[] = {
static const struct match_token token[] = {
{1, "%d.%d.%d"},
{0, NULL}
};

4
fs/unicode/utf8-selftest.c
View File

@ -35,7 +35,7 @@ unsigned int total_tests;
#define test_f(cond, fmt, ...) _test(cond, __func__, __LINE__, fmt, ##__VA_ARGS__)
#define test(cond) _test(cond, __func__, __LINE__, "")
const static struct {
static const struct {
/* UTF-8 strings in this vector _must_ be NULL-terminated. */
unsigned char str[10];
unsigned char dec[10];
@ -89,7 +89,7 @@ const static struct {
};
const static struct {
static const struct {
/* UTF-8 strings in this vector _must_ be NULL-terminated. */
unsigned char str[30];
unsigned char ncf[30];