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Some locking and page fault bug fixes from Jan Kara, some ext4 

encryption fixes from me, and Li Xi's Project Quota commits.
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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:
 "Some locking and page fault bug fixes from Jan Kara, some ext4
  encryption fixes from me, and Li Xi's Project Quota commits"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  fs: clean up the flags definition in uapi/linux/fs.h
  ext4: add FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support
  ext4: add project quota support
  ext4: adds project ID support
  ext4 crypto: simplify interfaces to directory entry insert functions
  ext4 crypto: add missing locking for keyring_key access
  ext4: use pre-zeroed blocks for DAX page faults
  ext4: implement allocation of pre-zeroed blocks
  ext4: provide ext4_issue_zeroout()
  ext4: get rid of EXT4_GET_BLOCKS_NO_LOCK flag
  ext4: document lock ordering
  ext4: fix races of writeback with punch hole and zero range
  ext4: fix races between buffered IO and collapse / insert range
  ext4: move unlocked dio protection from ext4_alloc_file_blocks()
  ext4: fix races between page faults and hole punching
This commit is contained in:
Linus Torvalds 2016-01-22 11:23:35 -08:00
parent d5ffdf8b4a 68ce7bfcd9
commit 391f2a16b7
14 changed files with 895 additions and 276 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/ext4/crypto.c
View File

@ -384,14 +384,12 @@ int ext4_decrypt(struct page *page)
EXT4_DECRYPT, page->index, page, page);
}
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex)
int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len)
{
struct ext4_crypto_ctx *ctx;
struct page *ciphertext_page = NULL;
struct bio *bio;
ext4_lblk_t lblk = le32_to_cpu(ex->ee_block);
ext4_fsblk_t pblk = ext4_ext_pblock(ex);
unsigned int len = ext4_ext_get_actual_len(ex);
int ret, err = 0;
#if 0

4
fs/ext4/crypto_key.c
View File

@ -213,9 +213,11 @@ retry:
res = -ENOKEY;
goto out;
}
down_read(&keyring_key->sem);
ukp = user_key_payload(keyring_key);
if (ukp->datalen != sizeof(struct ext4_encryption_key)) {
res = -EINVAL;
up_read(&keyring_key->sem);
goto out;
}
master_key = (struct ext4_encryption_key *)ukp->data;
@ -226,10 +228,12 @@ retry:
"ext4: key size incorrect: %d\n",
master_key->size);
res = -ENOKEY;
up_read(&keyring_key->sem);
goto out;
}
res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
raw_key);
up_read(&keyring_key->sem);
if (res)
goto out;
got_key:

99
fs/ext4/ext4.h
View File

@ -378,14 +378,22 @@ struct flex_groups {
#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
#define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */
#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
EXT4_IMMUTABLE_FL | \
EXT4_APPEND_FL | \
EXT4_NODUMP_FL | \
EXT4_NOATIME_FL | \
EXT4_PROJINHERIT_FL)
/* Flags that should be inherited by new inodes from their parent. */
#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
EXT4_PROJINHERIT_FL)
/* Flags that are appropriate for regular files (all but dir-specific ones). */
#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
@ -555,10 +563,12 @@ enum {
#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
/* Request will not result in inode size update (user for fallocate) */
#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
/* Do not take i_data_sem locking in ext4_map_blocks */
#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
/* Convert written extents to unwritten */
#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
/* Write zeros to newly created written extents */
#define EXT4_GET_BLOCKS_ZERO 0x0200
#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
EXT4_GET_BLOCKS_ZERO)
/*
* The bit position of these flags must not overlap with any of the
@ -616,6 +626,46 @@ enum {
#define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
#define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
#ifndef FS_IOC_FSGETXATTR
/* Until the uapi changes get merged for project quota... */
#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
/*
* Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
*/
struct fsxattr {
__u32 fsx_xflags; /* xflags field value (get/set) */
__u32 fsx_extsize; /* extsize field value (get/set)*/
__u32 fsx_nextents; /* nextents field value (get) */
__u32 fsx_projid; /* project identifier (get/set) */
unsigned char fsx_pad[12];
};
/*
* Flags for the fsx_xflags field
*/
#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
#define FS_XFLAG_APPEND 0x00000010 /* all writes append */
#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
#endif /* !defined(FS_IOC_FSGETXATTR) */
#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
* ioctl commands in 32 bit emulation
@ -910,6 +960,15 @@ struct ext4_inode_info {
* by other means, so we have i_data_sem.
*/
struct rw_semaphore i_data_sem;
/*
* i_mmap_sem is for serializing page faults with truncate / punch hole
* operations. We have to make sure that new page cannot be faulted in
* a section of the inode that is being punched. We cannot easily use
* i_data_sem for this since we need protection for the whole punch
* operation and i_data_sem ranks below transaction start so we have
* to occasionally drop it.
*/
struct rw_semaphore i_mmap_sem;
struct inode vfs_inode;
struct jbd2_inode *jinode;
@ -993,6 +1052,7 @@ struct ext4_inode_info {
/* Encryption params */
struct ext4_crypt_info *i_crypt_info;
#endif
kprojid_t i_projid;
};
/*
@ -1248,7 +1308,7 @@ struct ext4_super_block {
#endif
/* Number of quota types we support */
#define EXT4_MAXQUOTAS 2
#define EXT4_MAXQUOTAS 3
/*
* fourth extended-fs super-block data in memory
@ -1754,7 +1814,8 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
EXT4_FEATURE_RO_COMPAT_QUOTA)
EXT4_FEATURE_RO_COMPAT_QUOTA |\
EXT4_FEATURE_RO_COMPAT_PROJECT)
#define EXTN_FEATURE_FUNCS(ver) \
static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
@ -1796,6 +1857,11 @@ static inline bool ext4_has_incompat_features(struct super_block *sb)
#define EXT4_DEF_RESUID 0
#define EXT4_DEF_RESGID 0
/*
* Default project ID
*/
#define EXT4_DEF_PROJID 0
#define EXT4_DEF_INODE_READAHEAD_BLKS 32
/*
@ -2234,7 +2300,8 @@ void ext4_restore_control_page(struct page *data_page);
struct page *ext4_encrypt(struct inode *inode,
struct page *plaintext_page);
int ext4_decrypt(struct page *page);
int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int ext4_init_crypto(void);
@ -2440,8 +2507,8 @@ struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
int ext4_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
int ext4_get_block_dax(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
int ext4_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
@ -2484,9 +2551,13 @@ extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
loff_t lstart, loff_t lend);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
extern qsize_t *ext4_get_reserved_space(struct inode *inode);
extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
extern void ext4_da_update_reserve_space(struct inode *inode,
int used, int quota_claim);
extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len);
/* indirect.c */
extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
@ -2848,6 +2919,9 @@ static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
return changed;
}
int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
loff_t len);
struct ext4_group_info {
unsigned long bb_state;
struct rb_root bb_free_root;
@ -2986,8 +3060,7 @@ extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
struct page *page);
extern int ext4_try_add_inline_entry(handle_t *handle,
struct ext4_filename *fname,
struct dentry *dentry,
struct inode *inode);
struct inode *dir, struct inode *inode);
extern int ext4_try_create_inline_dir(handle_t *handle,
struct inode *parent,
struct inode *inode);

153
fs/ext4/extents.c
View File

@ -3119,19 +3119,11 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
{
ext4_fsblk_t ee_pblock;
unsigned int ee_len;
int ret;
ee_len = ext4_ext_get_actual_len(ex);
ee_pblock = ext4_ext_pblock(ex);
if (ext4_encrypted_inode(inode))
return ext4_encrypted_zeroout(inode, ex);
ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS);
if (ret > 0)
ret = 0;
return ret;
return ext4_issue_zeroout(inode, le32_to_cpu(ex->ee_block), ee_pblock,
ee_len);
}
/*
@ -4052,6 +4044,14 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
}
/* IO end_io complete, convert the filled extent to written */
if (flags & EXT4_GET_BLOCKS_CONVERT) {
if (flags & EXT4_GET_BLOCKS_ZERO) {
if (allocated > map->m_len)
allocated = map->m_len;
err = ext4_issue_zeroout(inode, map->m_lblk, newblock,
allocated);
if (err < 0)
goto out2;
}
ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
ppath);
if (ret >= 0) {
@ -4685,10 +4685,6 @@ static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
if (len <= EXT_UNWRITTEN_MAX_LEN)
flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
/*
* credits to insert 1 extent into extent tree
*/
@ -4752,8 +4748,6 @@ retry:
goto retry;
}
ext4_inode_resume_unlocked_dio(inode);
return ret > 0 ? ret2 : ret;
}
@ -4770,7 +4764,6 @@ static long ext4_zero_range(struct file *file, loff_t offset,
int partial_begin, partial_end;
loff_t start, end;
ext4_lblk_t lblk;
struct address_space *mapping = inode->i_mapping;
unsigned int blkbits = inode->i_blkbits;
trace_ext4_zero_range(inode, offset, len, mode);
@ -4785,17 +4778,6 @@ static long ext4_zero_range(struct file *file, loff_t offset,
return ret;
}
/*
* Write out all dirty pages to avoid race conditions
* Then release them.
*/
if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
ret = filemap_write_and_wait_range(mapping, offset,
offset + len - 1);
if (ret)
return ret;
}
/*
* Round up offset. This is not fallocate, we neet to zero out
* blocks, so convert interior block aligned part of the range to
@ -4839,6 +4821,10 @@ static long ext4_zero_range(struct file *file, loff_t offset,
if (mode & FALLOC_FL_KEEP_SIZE)
flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
/* Preallocate the range including the unaligned edges */
if (partial_begin || partial_end) {
ret = ext4_alloc_file_blocks(file,
@ -4847,7 +4833,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
round_down(offset, 1 << blkbits)) >> blkbits,
new_size, flags, mode);
if (ret)
goto out_mutex;
goto out_dio;
}
@ -4856,16 +4842,23 @@ static long ext4_zero_range(struct file *file, loff_t offset,
flags |= (EXT4_GET_BLOCKS_CONVERT_UNWRITTEN |
EXT4_EX_NOCACHE);
/* Now release the pages and zero block aligned part of pages*/
/*
* Prevent page faults from reinstantiating pages we have
* released from page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
ret = ext4_update_disksize_before_punch(inode, offset, len);
if (ret) {
up_write(&EXT4_I(inode)->i_mmap_sem);
goto out_dio;
}
/* Now release the pages and zero block aligned part of pages */
truncate_pagecache_range(inode, start, end - 1);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
flags, mode);
up_write(&EXT4_I(inode)->i_mmap_sem);
if (ret)
goto out_dio;
}
@ -4998,8 +4991,13 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
goto out;
}
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
flags, mode);
ext4_inode_resume_unlocked_dio(inode);
if (ret)
goto out;
@ -5494,21 +5492,7 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
return ret;
}
/*
* Need to round down offset to be aligned with page size boundary
* for page size > block size.
*/
ioffset = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
LLONG_MAX);
if (ret)
return ret;
/* Take mutex lock */
mutex_lock(&inode->i_mutex);
/*
* There is no need to overlap collapse range with EOF, in which case
* it is effectively a truncate operation
@ -5524,17 +5508,43 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
goto out_mutex;
}
truncate_pagecache(inode, ioffset);
/* Wait for existing dio to complete */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
/*
* Prevent page faults from reinstantiating pages we have released from
* page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
/*
* Need to round down offset to be aligned with page size boundary
* for page size > block size.
*/
ioffset = round_down(offset, PAGE_SIZE);
/*
* Write tail of the last page before removed range since it will get
* removed from the page cache below.
*/
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset, offset);
if (ret)
goto out_mmap;
/*
* Write data that will be shifted to preserve them when discarding
* page cache below. We are also protected from pages becoming dirty
* by i_mmap_sem.
*/
ret = filemap_write_and_wait_range(inode->i_mapping, offset + len,
LLONG_MAX);
if (ret)
goto out_mmap;
truncate_pagecache(inode, ioffset);
credits = ext4_writepage_trans_blocks(inode);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out_dio;
goto out_mmap;
}
down_write(&EXT4_I(inode)->i_data_sem);
@ -5573,7 +5583,8 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
out_stop:
ext4_journal_stop(handle);
out_dio:
out_mmap:
up_write(&EXT4_I(inode)->i_mmap_sem);
ext4_inode_resume_unlocked_dio(inode);
out_mutex:
mutex_unlock(&inode->i_mutex);
@ -5627,21 +5638,7 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
return ret;
}
/*
* Need to round down to align start offset to page size boundary
* for page size > block size.
*/
ioffset = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
LLONG_MAX);
if (ret)
return ret;
/* Take mutex lock */
mutex_lock(&inode->i_mutex);
/* Currently just for extent based files */
if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
ret = -EOPNOTSUPP;
@ -5660,17 +5657,32 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
goto out_mutex;
}
truncate_pagecache(inode, ioffset);
/* Wait for existing dio to complete */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
/*
* Prevent page faults from reinstantiating pages we have released from
* page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
/*
* Need to round down to align start offset to page size boundary
* for page size > block size.
*/
ioffset = round_down(offset, PAGE_SIZE);
/* Write out all dirty pages */
ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
LLONG_MAX);
if (ret)
goto out_mmap;
truncate_pagecache(inode, ioffset);
credits = ext4_writepage_trans_blocks(inode);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out_dio;
goto out_mmap;
}
/* Expand file to avoid data loss if there is error while shifting */
@ -5741,7 +5753,8 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
out_stop:
ext4_journal_stop(handle);
out_dio:
out_mmap:
up_write(&EXT4_I(inode)->i_mmap_sem);
ext4_inode_resume_unlocked_dio(inode);
out_mutex:
mutex_unlock(&inode->i_mutex);

82
fs/ext4/file.c
View File

@ -193,43 +193,35 @@ out:
}
#ifdef CONFIG_FS_DAX
static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
{
struct inode *inode = bh->b_assoc_map->host;
/* XXX: breaks on 32-bit > 16TB. Is that even supported? */
loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits;
int err;
if (!uptodate)
return;
WARN_ON(!buffer_unwritten(bh));
err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size);
}
static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
int result;
handle_t *handle = NULL;
struct super_block *sb = file_inode(vma->vm_file)->i_sb;
struct inode *inode = file_inode(vma->vm_file);
struct super_block *sb = inode->i_sb;
bool write = vmf->flags & FAULT_FLAG_WRITE;
if (write) {
sb_start_pagefault(sb);
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
EXT4_DATA_TRANS_BLOCKS(sb));
}
} else
down_read(&EXT4_I(inode)->i_mmap_sem);
if (IS_ERR(handle))
result = VM_FAULT_SIGBUS;
else
result = __dax_fault(vma, vmf, ext4_get_block_dax,
ext4_end_io_unwritten);
result = __dax_fault(vma, vmf, ext4_dax_mmap_get_block, NULL);
if (write) {
if (!IS_ERR(handle))
ext4_journal_stop(handle);
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(sb);
}
} else
up_read(&EXT4_I(inode)->i_mmap_sem);
return result;
}
@ -246,44 +238,86 @@ static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
if (write) {
sb_start_pagefault(sb);
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
ext4_chunk_trans_blocks(inode,
PMD_SIZE / PAGE_SIZE));
}
} else
down_read(&EXT4_I(inode)->i_mmap_sem);
if (IS_ERR(handle))
result = VM_FAULT_SIGBUS;
else
result = __dax_pmd_fault(vma, addr, pmd, flags,
ext4_get_block_dax, ext4_end_io_unwritten);
ext4_dax_mmap_get_block, NULL);
if (write) {
if (!IS_ERR(handle))
ext4_journal_stop(handle);
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(sb);
}
} else
up_read(&EXT4_I(inode)->i_mmap_sem);
return result;
}
static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
return dax_mkwrite(vma, vmf, ext4_get_block_dax,
ext4_end_io_unwritten);
int err;
struct inode *inode = file_inode(vma->vm_file);
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
err = __dax_mkwrite(vma, vmf, ext4_dax_mmap_get_block, NULL);
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(inode->i_sb);
return err;
}
/*
* Handle write fault for VM_MIXEDMAP mappings. Similarly to ext4_dax_mkwrite()
* handler we check for races agaist truncate. Note that since we cycle through
* i_mmap_sem, we are sure that also any hole punching that began before we
* were called is finished by now and so if it included part of the file we
* are working on, our pte will get unmapped and the check for pte_same() in
* wp_pfn_shared() fails. Thus fault gets retried and things work out as
* desired.
*/
static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
struct super_block *sb = inode->i_sb;
int ret = VM_FAULT_NOPAGE;
loff_t size;
sb_start_pagefault(sb);
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (vmf->pgoff >= size)
ret = VM_FAULT_SIGBUS;
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(sb);
return ret;
}
static const struct vm_operations_struct ext4_dax_vm_ops = {
.fault = ext4_dax_fault,
.pmd_fault = ext4_dax_pmd_fault,
.page_mkwrite = ext4_dax_mkwrite,
.pfn_mkwrite = dax_pfn_mkwrite,
.pfn_mkwrite = ext4_dax_pfn_mkwrite,
};
#else
#define ext4_dax_vm_ops ext4_file_vm_ops
#endif
static const struct vm_operations_struct ext4_file_vm_ops = {
.fault = filemap_fault,
.fault = ext4_filemap_fault,
.map_pages = filemap_map_pages,
.page_mkwrite = ext4_page_mkwrite,
};

7
fs/ext4/ialloc.c
View File

@ -799,6 +799,13 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
inode->i_gid = dir->i_gid;
} else
inode_init_owner(inode, dir, mode);
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
ei->i_projid = EXT4_I(dir)->i_projid;
else
ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID);
err = dquot_initialize(inode);
if (err)
goto out;

10
fs/ext4/inline.c
View File

@ -995,12 +995,11 @@ void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
*/
static int ext4_add_dirent_to_inline(handle_t *handle,
struct ext4_filename *fname,
struct dentry *dentry,
struct inode *dir,
struct inode *inode,
struct ext4_iloc *iloc,
void *inline_start, int inline_size)
{
struct inode *dir = d_inode(dentry->d_parent);
int err;
struct ext4_dir_entry_2 *de;
@ -1245,12 +1244,11 @@ out:
* the new created block.
*/
int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
struct dentry *dentry, struct inode *inode)
struct inode *dir, struct inode *inode)
{
int ret, inline_size;
void *inline_start;
struct ext4_iloc iloc;
struct inode *dir = d_inode(dentry->d_parent);
ret = ext4_get_inode_loc(dir, &iloc);
if (ret)
@ -1264,7 +1262,7 @@ int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
EXT4_INLINE_DOTDOT_SIZE;
inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
ret = ext4_add_dirent_to_inline(handle, fname, dentry, inode, &iloc,
ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
inline_start, inline_size);
if (ret != -ENOSPC)
goto out;
@ -1285,7 +1283,7 @@ int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
if (inline_size) {
inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
ret = ext4_add_dirent_to_inline(handle, fname, dentry,
ret = ext4_add_dirent_to_inline(handle, fname, dir,
inode, &iloc, inline_start,
inline_size);

268
fs/ext4/inode.c
View File

@ -383,6 +383,21 @@ static int __check_block_validity(struct inode *inode, const char *func,
return 0;
}
int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, ext4_fsblk_t pblk,
ext4_lblk_t len)
{
int ret;
if (ext4_encrypted_inode(inode))
return ext4_encrypted_zeroout(inode, lblk, pblk, len);
ret = sb_issue_zeroout(inode->i_sb, pblk, len, GFP_NOFS);
if (ret > 0)
ret = 0;
return ret;
}
#define check_block_validity(inode, map) \
__check_block_validity((inode), __func__, __LINE__, (map))
@ -403,8 +418,7 @@ static void ext4_map_blocks_es_recheck(handle_t *handle,
* out taking i_data_sem. So at the time the unwritten extent
* could be converted.
*/
if (!(flags & EXT4_GET_BLOCKS_NO_LOCK))
down_read(&EXT4_I(inode)->i_data_sem);
down_read(&EXT4_I(inode)->i_data_sem);
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
retval = ext4_ext_map_blocks(handle, inode, map, flags &
EXT4_GET_BLOCKS_KEEP_SIZE);
@ -412,8 +426,7 @@ static void ext4_map_blocks_es_recheck(handle_t *handle,
retval = ext4_ind_map_blocks(handle, inode, map, flags &
EXT4_GET_BLOCKS_KEEP_SIZE);
}
if (!(flags & EXT4_GET_BLOCKS_NO_LOCK))
up_read((&EXT4_I(inode)->i_data_sem));
up_read((&EXT4_I(inode)->i_data_sem));
/*
* We don't check m_len because extent will be collpased in status
@ -509,8 +522,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
* Try to see if we can get the block without requesting a new
* file system block.
*/
if (!(flags & EXT4_GET_BLOCKS_NO_LOCK))
down_read(&EXT4_I(inode)->i_data_sem);
down_read(&EXT4_I(inode)->i_data_sem);
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
retval = ext4_ext_map_blocks(handle, inode, map, flags &
EXT4_GET_BLOCKS_KEEP_SIZE);
@ -541,8 +553,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
if (ret < 0)
retval = ret;
}
if (!(flags & EXT4_GET_BLOCKS_NO_LOCK))
up_read((&EXT4_I(inode)->i_data_sem));
up_read((&EXT4_I(inode)->i_data_sem));
found:
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
@ -625,6 +636,22 @@ found:
WARN_ON(1);
}
/*
* We have to zeroout blocks before inserting them into extent
* status tree. Otherwise someone could look them up there and
* use them before they are really zeroed.
*/
if (flags & EXT4_GET_BLOCKS_ZERO &&
map->m_flags & EXT4_MAP_MAPPED &&
map->m_flags & EXT4_MAP_NEW) {
ret = ext4_issue_zeroout(inode, map->m_lblk,
map->m_pblk, map->m_len);
if (ret) {
retval = ret;
goto out_sem;
}
}
/*
* If the extent has been zeroed out, we don't need to update
* extent status tree.
@ -632,7 +659,7 @@ found:
if ((flags & EXT4_GET_BLOCKS_PRE_IO) &&
ext4_es_lookup_extent(inode, map->m_lblk, &es)) {
if (ext4_es_is_written(&es))
goto has_zeroout;
goto out_sem;
}
status = map->m_flags & EXT4_MAP_UNWRITTEN ?
EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
@ -643,11 +670,13 @@ found:
status |= EXTENT_STATUS_DELAYED;
ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len,
map->m_pblk, status);
if (ret < 0)
if (ret < 0) {
retval = ret;
goto out_sem;
}
}
has_zeroout:
out_sem:
up_write((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
ret = check_block_validity(inode, map);
@ -674,7 +703,7 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
if (flags && !(flags & EXT4_GET_BLOCKS_NO_LOCK) && !handle) {
if (flags && !handle) {
/* Direct IO write... */
if (map.m_len > DIO_MAX_BLOCKS)
map.m_len = DIO_MAX_BLOCKS;
@ -694,16 +723,6 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
map_bh(bh, inode->i_sb, map.m_pblk);
bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags;
if (IS_DAX(inode) && buffer_unwritten(bh)) {
/*
* dgc: I suspect unwritten conversion on ext4+DAX is
* fundamentally broken here when there are concurrent
* read/write in progress on this inode.
*/
WARN_ON_ONCE(io_end);
bh->b_assoc_map = inode->i_mapping;
bh->b_private = (void *)(unsigned long)iblock;
}
if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
set_buffer_defer_completion(bh);
bh->b_size = inode->i_sb->s_blocksize * map.m_len;
@ -879,9 +898,6 @@ int do_journal_get_write_access(handle_t *handle,
return ret;
}
static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block)
@ -3054,25 +3070,96 @@ int ext4_get_block_write(struct inode *inode, sector_t iblock,
EXT4_GET_BLOCKS_IO_CREATE_EXT);
}
static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock,
static int ext4_get_block_overwrite(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n",
int ret;
ext4_debug("ext4_get_block_overwrite: inode %lu, create flag %d\n",
inode->i_ino, create);
return _ext4_get_block(inode, iblock, bh_result,
EXT4_GET_BLOCKS_NO_LOCK);
ret = _ext4_get_block(inode, iblock, bh_result, 0);
/*
* Blocks should have been preallocated! ext4_file_write_iter() checks
* that.
*/
WARN_ON_ONCE(!buffer_mapped(bh_result));
return ret;
}
int ext4_get_block_dax(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
#ifdef CONFIG_FS_DAX
int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int flags = EXT4_GET_BLOCKS_PRE_IO | EXT4_GET_BLOCKS_UNWRIT_EXT;
if (create)
flags |= EXT4_GET_BLOCKS_CREATE;
ext4_debug("ext4_get_block_dax: inode %lu, create flag %d\n",
int ret, err;
int credits;
struct ext4_map_blocks map;
handle_t *handle = NULL;
int flags = 0;
ext4_debug("ext4_dax_mmap_get_block: inode %lu, create flag %d\n",
inode->i_ino, create);
return _ext4_get_block(inode, iblock, bh_result, flags);
map.m_lblk = iblock;
map.m_len = bh_result->b_size >> inode->i_blkbits;
credits = ext4_chunk_trans_blocks(inode, map.m_len);
if (create) {
flags |= EXT4_GET_BLOCKS_PRE_IO | EXT4_GET_BLOCKS_CREATE_ZERO;
handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
return ret;
}
}
ret = ext4_map_blocks(handle, inode, &map, flags);
if (create) {
err = ext4_journal_stop(handle);
if (ret >= 0 && err < 0)
ret = err;
}
if (ret <= 0)
goto out;
if (map.m_flags & EXT4_MAP_UNWRITTEN) {
int err2;
/*
* We are protected by i_mmap_sem so we know block cannot go
* away from under us even though we dropped i_data_sem.
* Convert extent to written and write zeros there.
*
* Note: We may get here even when create == 0.
*/
handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
}
err = ext4_map_blocks(handle, inode, &map,
EXT4_GET_BLOCKS_CONVERT | EXT4_GET_BLOCKS_CREATE_ZERO);
if (err < 0)
ret = err;
err2 = ext4_journal_stop(handle);
if (err2 < 0 && ret > 0)
ret = err2;
}
out:
WARN_ON_ONCE(ret == 0 && create);
if (ret > 0) {
map_bh(bh_result, inode->i_sb, map.m_pblk);
bh_result->b_state = (bh_result->b_state & ~EXT4_MAP_FLAGS) |
map.m_flags;
/*
* At least for now we have to clear BH_New so that DAX code
* doesn't attempt to zero blocks again in a racy way.
*/
bh_result->b_state &= ~(1 << BH_New);
bh_result->b_size = map.m_len << inode->i_blkbits;
ret = 0;
}
return ret;
}
#endif
static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
ssize_t size, void *private)
@ -3143,10 +3230,8 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
/* If we do a overwrite dio, i_mutex locking can be released */
overwrite = *((int *)iocb->private);
if (overwrite) {
down_read(&EXT4_I(inode)->i_data_sem);
if (overwrite)
mutex_unlock(&inode->i_mutex);
}
/*
* We could direct write to holes and fallocate.
@ -3189,7 +3274,7 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
}
if (overwrite) {
get_block_func = ext4_get_block_write_nolock;
get_block_func = ext4_get_block_overwrite;
} else {
get_block_func = ext4_get_block_write;
dio_flags = DIO_LOCKING;
@ -3245,10 +3330,8 @@ retake_lock:
if (iov_iter_rw(iter) == WRITE)
inode_dio_end(inode);
/* take i_mutex locking again if we do a ovewrite dio */
if (overwrite) {
up_read(&EXT4_I(inode)->i_data_sem);
if (overwrite)
mutex_lock(&inode->i_mutex);
}
return ret;
}
@ -3558,6 +3641,35 @@ int ext4_can_truncate(struct inode *inode)
return 0;
}
/*
* We have to make sure i_disksize gets properly updated before we truncate
* page cache due to hole punching or zero range. Otherwise i_disksize update
* can get lost as it may have been postponed to submission of writeback but
* that will never happen after we truncate page cache.
*/
int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
loff_t len)
{
handle_t *handle;
loff_t size = i_size_read(inode);
WARN_ON(!mutex_is_locked(&inode->i_mutex));
if (offset > size || offset + len < size)
return 0;
if (EXT4_I(inode)->i_disksize >= size)
return 0;
handle = ext4_journal_start(inode, EXT4_HT_MISC, 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
ext4_update_i_disksize(inode, size);
ext4_mark_inode_dirty(handle, inode);
ext4_journal_stop(handle);
return 0;
}
/*
* ext4_punch_hole: punches a hole in a file by releaseing the blocks
* associated with the given offset and length
@ -3623,17 +3735,26 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
}
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
/*
* Prevent page faults from reinstantiating pages we have released from
* page cache.
*/
down_write(&EXT4_I(inode)->i_mmap_sem);
first_block_offset = round_up(offset, sb->s_blocksize);
last_block_offset = round_down((offset + length), sb->s_blocksize) - 1;
/* Now release the pages and zero block aligned part of pages*/
if (last_block_offset > first_block_offset)
if (last_block_offset > first_block_offset) {
ret = ext4_update_disksize_before_punch(inode, offset, length);
if (ret)
goto out_dio;
truncate_pagecache_range(inode, first_block_offset,
last_block_offset);
/* Wait all existing dio workers, newcomers will block on i_mutex */
ext4_inode_block_unlocked_dio(inode);
inode_dio_wait(inode);
}
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
credits = ext4_writepage_trans_blocks(inode);
@ -3680,16 +3801,12 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
if (IS_SYNC(inode))
ext4_handle_sync(handle);
/* Now release the pages again to reduce race window */
if (last_block_offset > first_block_offset)
truncate_pagecache_range(inode, first_block_offset,
last_block_offset);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
out_stop:
ext4_journal_stop(handle);
out_dio:
up_write(&EXT4_I(inode)->i_mmap_sem);
ext4_inode_resume_unlocked_dio(inode);
out_mutex:
mutex_unlock(&inode->i_mutex);
@ -4076,6 +4193,14 @@ static inline void ext4_iget_extra_inode(struct inode *inode,
EXT4_I(inode)->i_inline_off = 0;
}
int ext4_get_projid(struct inode *inode, kprojid_t *projid)
{
if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, EXT4_FEATURE_RO_COMPAT_PROJECT))
return -EOPNOTSUPP;
*projid = EXT4_I(inode)->i_projid;
return 0;
}
struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
{
struct ext4_iloc iloc;
@ -4087,6 +4212,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
int block;
uid_t i_uid;
gid_t i_gid;
projid_t i_projid;
inode = iget_locked(sb, ino);
if (!inode)
@ -4136,12 +4262,20 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
inode->i_mode = le16_to_cpu(raw_inode->i_mode);
i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low);
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
EXT4_INODE_SIZE(sb) > EXT4_GOOD_OLD_INODE_SIZE &&
EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))
i_projid = (projid_t)le32_to_cpu(raw_inode->i_projid);
else
i_projid = EXT4_DEF_PROJID;
if (!(test_opt(inode->i_sb, NO_UID32))) {
i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16;
i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
}
i_uid_write(inode, i_uid);
i_gid_write(inode, i_gid);
ei->i_projid = make_kprojid(&init_user_ns, i_projid);
set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
@ -4440,6 +4574,7 @@ static int ext4_do_update_inode(handle_t *handle,
int need_datasync = 0, set_large_file = 0;
uid_t i_uid;
gid_t i_gid;
projid_t i_projid;
spin_lock(&ei->i_raw_lock);
@ -4452,6 +4587,7 @@ static int ext4_do_update_inode(handle_t *handle,
raw_inode->i_mode = cpu_to_le16(inode->i_mode);
i_uid = i_uid_read(inode);
i_gid = i_gid_read(inode);
i_projid = from_kprojid(&init_user_ns, ei->i_projid);
if (!(test_opt(inode->i_sb, NO_UID32))) {
raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid));
raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid));
@ -4529,6 +4665,15 @@ static int ext4_do_update_inode(handle_t *handle,
cpu_to_le16(ei->i_extra_isize);
}
}
BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
EXT4_FEATURE_RO_COMPAT_PROJECT) &&
i_projid != EXT4_DEF_PROJID);
if (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE &&
EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))
raw_inode->i_projid = cpu_to_le32(i_projid);
ext4_inode_csum_set(inode, raw_inode, ei);
spin_unlock(&ei->i_raw_lock);
if (inode->i_sb->s_flags & MS_LAZYTIME)
@ -4824,6 +4969,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
} else
ext4_wait_for_tail_page_commit(inode);
}
down_write(&EXT4_I(inode)->i_mmap_sem);
/*
* Truncate pagecache after we've waited for commit
* in data=journal mode to make pages freeable.
@ -4831,6 +4977,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
truncate_pagecache(inode, inode->i_size);
if (shrink)
ext4_truncate(inode);
up_write(&EXT4_I(inode)->i_mmap_sem);
}
if (!rc) {
@ -5279,6 +5426,8 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
sb_start_pagefault(inode->i_sb);
file_update_time(vma->vm_file);
down_read(&EXT4_I(inode)->i_mmap_sem);
/* Delalloc case is easy... */
if (test_opt(inode->i_sb, DELALLOC) &&
!ext4_should_journal_data(inode) &&
@ -5348,6 +5497,19 @@ retry_alloc:
out_ret:
ret = block_page_mkwrite_return(ret);
out:
up_read(&EXT4_I(inode)->i_mmap_sem);
sb_end_pagefault(inode->i_sb);
return ret;
}
int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
int err;
down_read(&EXT4_I(inode)->i_mmap_sem);
err = filemap_fault(vma, vmf);
up_read(&EXT4_I(inode)->i_mmap_sem);
return err;
}

376
fs/ext4/ioctl.c
View File

@ -14,6 +14,7 @@
#include <linux/mount.h>
#include <linux/file.h>
#include <linux/random.h>
#include <linux/quotaops.h>
#include <asm/uaccess.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@ -202,6 +203,238 @@ static int uuid_is_zero(__u8 u[16])
return 1;
}
static int ext4_ioctl_setflags(struct inode *inode,
unsigned int flags)
{
struct ext4_inode_info *ei = EXT4_I(inode);
handle_t *handle = NULL;
int err = EPERM, migrate = 0;
struct ext4_iloc iloc;
unsigned int oldflags, mask, i;
unsigned int jflag;
/* Is it quota file? Do not allow user to mess with it */
if (IS_NOQUOTA(inode))
goto flags_out;
oldflags = ei->i_flags;
/* The JOURNAL_DATA flag is modifiable only by root */
jflag = flags & EXT4_JOURNAL_DATA_FL;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*
* This test looks nicer. Thanks to Pauline Middelink
*/
if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE))
goto flags_out;
}
/*
* The JOURNAL_DATA flag can only be changed by
* the relevant capability.
*/
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
if (!capable(CAP_SYS_RESOURCE))
goto flags_out;
}
if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
migrate = 1;
if (flags & EXT4_EOFBLOCKS_FL) {
/* we don't support adding EOFBLOCKS flag */
if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
err = -EOPNOTSUPP;
goto flags_out;
}
} else if (oldflags & EXT4_EOFBLOCKS_FL)
ext4_truncate(inode);
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
goto flags_out;
}
if (IS_SYNC(inode))
ext4_handle_sync(handle);
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (err)
goto flags_err;
for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
if (!(mask & EXT4_FL_USER_MODIFIABLE))
continue;
if (mask & flags)
ext4_set_inode_flag(inode, i);
else
ext4_clear_inode_flag(inode, i);
}
ext4_set_inode_flags(inode);
inode->i_ctime = ext4_current_time(inode);
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
ext4_journal_stop(handle);
if (err)
goto flags_out;
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
err = ext4_change_inode_journal_flag(inode, jflag);
if (err)
goto flags_out;
if (migrate) {
if (flags & EXT4_EXTENTS_FL)
err = ext4_ext_migrate(inode);
else
err = ext4_ind_migrate(inode);
}
flags_out:
return err;
}
#ifdef CONFIG_QUOTA
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
{
struct inode *inode = file_inode(filp);
struct super_block *sb = inode->i_sb;
struct ext4_inode_info *ei = EXT4_I(inode);
int err, rc;
handle_t *handle;
kprojid_t kprojid;
struct ext4_iloc iloc;
struct ext4_inode *raw_inode;
if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
EXT4_FEATURE_RO_COMPAT_PROJECT)) {
if (projid != EXT4_DEF_PROJID)
return -EOPNOTSUPP;
else
return 0;
}
if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
return -EOPNOTSUPP;
kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
return 0;
err = mnt_want_write_file(filp);
if (err)
return err;
err = -EPERM;
mutex_lock(&inode->i_mutex);
/* Is it quota file? Do not allow user to mess with it */
if (IS_NOQUOTA(inode))
goto out_unlock;
err = ext4_get_inode_loc(inode, &iloc);
if (err)
goto out_unlock;
raw_inode = ext4_raw_inode(&iloc);
if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
err = -EOVERFLOW;
brelse(iloc.bh);
goto out_unlock;
}
brelse(iloc.bh);
dquot_initialize(inode);
handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
EXT4_QUOTA_INIT_BLOCKS(sb) +
EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
goto out_unlock;
}
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (err)
goto out_stop;
if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
struct dquot *transfer_to[MAXQUOTAS] = { };
transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
if (transfer_to[PRJQUOTA]) {
err = __dquot_transfer(inode, transfer_to);
dqput(transfer_to[PRJQUOTA]);
if (err)
goto out_dirty;
}
}
EXT4_I(inode)->i_projid = kprojid;
inode->i_ctime = ext4_current_time(inode);
out_dirty:
rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
if (!err)
err = rc;
out_stop:
ext4_journal_stop(handle);
out_unlock:
mutex_unlock(&inode->i_mutex);
mnt_drop_write_file(filp);
return err;
}
#else
static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
{
if (projid != EXT4_DEF_PROJID)
return -EOPNOTSUPP;
return 0;
}
#endif
/* Transfer internal flags to xflags */
static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
{
__u32 xflags = 0;
if (iflags & EXT4_SYNC_FL)
xflags |= FS_XFLAG_SYNC;
if (iflags & EXT4_IMMUTABLE_FL)
xflags |= FS_XFLAG_IMMUTABLE;
if (iflags & EXT4_APPEND_FL)
xflags |= FS_XFLAG_APPEND;
if (iflags & EXT4_NODUMP_FL)
xflags |= FS_XFLAG_NODUMP;
if (iflags & EXT4_NOATIME_FL)
xflags |= FS_XFLAG_NOATIME;
if (iflags & EXT4_PROJINHERIT_FL)
xflags |= FS_XFLAG_PROJINHERIT;
return xflags;
}
/* Transfer xflags flags to internal */
static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
{
unsigned long iflags = 0;
if (xflags & FS_XFLAG_SYNC)
iflags |= EXT4_SYNC_FL;
if (xflags & FS_XFLAG_IMMUTABLE)
iflags |= EXT4_IMMUTABLE_FL;
if (xflags & FS_XFLAG_APPEND)
iflags |= EXT4_APPEND_FL;
if (xflags & FS_XFLAG_NODUMP)
iflags |= EXT4_NODUMP_FL;
if (xflags & FS_XFLAG_NOATIME)
iflags |= EXT4_NOATIME_FL;
if (xflags & FS_XFLAG_PROJINHERIT)
iflags |= EXT4_PROJINHERIT_FL;
return iflags;
}
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@ -217,11 +450,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
return put_user(flags, (int __user *) arg);
case EXT4_IOC_SETFLAGS: {
handle_t *handle = NULL;
int err, migrate = 0;
struct ext4_iloc iloc;
unsigned int oldflags, mask, i;
unsigned int jflag;
int err;
if (!inode_owner_or_capable(inode))
return -EACCES;
@ -235,89 +464,8 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
flags = ext4_mask_flags(inode->i_mode, flags);
err = -EPERM;
mutex_lock(&inode->i_mutex);
/* Is it quota file? Do not allow user to mess with it */
if (IS_NOQUOTA(inode))
goto flags_out;
oldflags = ei->i_flags;
/* The JOURNAL_DATA flag is modifiable only by root */
jflag = flags & EXT4_JOURNAL_DATA_FL;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*
* This test looks nicer. Thanks to Pauline Middelink
*/
if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE))
goto flags_out;
}
/*
* The JOURNAL_DATA flag can only be changed by
* the relevant capability.
*/
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
if (!capable(CAP_SYS_RESOURCE))
goto flags_out;
}
if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
migrate = 1;
if (flags & EXT4_EOFBLOCKS_FL) {
/* we don't support adding EOFBLOCKS flag */
if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
err = -EOPNOTSUPP;
goto flags_out;
}
} else if (oldflags & EXT4_EOFBLOCKS_FL)
ext4_truncate(inode);
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
goto flags_out;
}
if (IS_SYNC(inode))
ext4_handle_sync(handle);
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (err)
goto flags_err;
for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
if (!(mask & EXT4_FL_USER_MODIFIABLE))
continue;
if (mask & flags)
ext4_set_inode_flag(inode, i);
else
ext4_clear_inode_flag(inode, i);
}
ext4_set_inode_flags(inode);
inode->i_ctime = ext4_current_time(inode);
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
flags_err:
ext4_journal_stop(handle);
if (err)
goto flags_out;
if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
err = ext4_change_inode_journal_flag(inode, jflag);
if (err)
goto flags_out;
if (migrate) {
if (flags & EXT4_EXTENTS_FL)
err = ext4_ext_migrate(inode);
else
err = ext4_ind_migrate(inode);
}
flags_out:
err = ext4_ioctl_setflags(inode, flags);
mutex_unlock(&inode->i_mutex);
mnt_drop_write_file(filp);
return err;
@ -689,6 +837,60 @@ encryption_policy_out:
return -EOPNOTSUPP;
#endif
}
case EXT4_IOC_FSGETXATTR:
{
struct fsxattr fa;
memset(&fa, 0, sizeof(struct fsxattr));
ext4_get_inode_flags(ei);
fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
EXT4_FEATURE_RO_COMPAT_PROJECT)) {
fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
EXT4_I(inode)->i_projid);
}
if (copy_to_user((struct fsxattr __user *)arg,
&fa, sizeof(fa)))
return -EFAULT;
return 0;
}
case EXT4_IOC_FSSETXATTR:
{
struct fsxattr fa;
int err;
if (copy_from_user(&fa, (struct fsxattr __user *)arg,
sizeof(fa)))
return -EFAULT;
/* Make sure caller has proper permission */
if (!inode_owner_or_capable(inode))
return -EACCES;
err = mnt_want_write_file(filp);
if (err)
return err;
flags = ext4_xflags_to_iflags(fa.fsx_xflags);
flags = ext4_mask_flags(inode->i_mode, flags);
mutex_lock(&inode->i_mutex);
flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
(flags & EXT4_FL_XFLAG_VISIBLE);
err = ext4_ioctl_setflags(inode, flags);
mutex_unlock(&inode->i_mutex);
mnt_drop_write_file(filp);
if (err)
return err;
err = ext4_ioctl_setproject(filp, fa.fsx_projid);
if (err)
return err;
return 0;
}
default:
return -ENOTTY;
}

34
fs/ext4/namei.c
View File

@ -273,7 +273,7 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **res_dir);
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
struct dentry *dentry, struct inode *inode);
struct inode *dir, struct inode *inode);
/* checksumming functions */
void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
@ -1928,10 +1928,9 @@ static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
* directory, and adds the dentry to the indexed directory.
*/
static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
struct dentry *dentry,
struct inode *dir,
struct inode *inode, struct buffer_head *bh)
{
struct inode *dir = d_inode(dentry->d_parent);
struct buffer_head *bh2;
struct dx_root *root;
struct dx_frame frames[2], *frame;
@ -2086,8 +2085,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
return retval;
if (ext4_has_inline_data(dir)) {
retval = ext4_try_add_inline_entry(handle, &fname,
dentry, inode);
retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
if (retval < 0)
goto out;
if (retval == 1) {
@ -2097,7 +2095,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
}
if (is_dx(dir)) {
retval = ext4_dx_add_entry(handle, &fname, dentry, inode);
retval = ext4_dx_add_entry(handle, &fname, dir, inode);
if (!retval || (retval != ERR_BAD_DX_DIR))
goto out;
ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
@ -2119,7 +2117,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
if (blocks == 1 && !dx_fallback &&
ext4_has_feature_dir_index(sb)) {
retval = make_indexed_dir(handle, &fname, dentry,
retval = make_indexed_dir(handle, &fname, dir,
inode, bh);
bh = NULL; /* make_indexed_dir releases bh */
goto out;
@ -2154,12 +2152,11 @@ out:
* Returns 0 for success, or a negative error value
*/
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
struct dentry *dentry, struct inode *inode)
struct inode *dir, struct inode *inode)
{
struct dx_frame frames[2], *frame;
struct dx_entry *entries, *at;
struct buffer_head *bh;
struct inode *dir = d_inode(dentry->d_parent);
struct super_block *sb = dir->i_sb;
struct ext4_dir_entry_2 *de;
int err;
@ -3212,6 +3209,12 @@ static int ext4_link(struct dentry *old_dentry,
if (ext4_encrypted_inode(dir) &&
!ext4_is_child_context_consistent_with_parent(dir, inode))
return -EPERM;
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
(!projid_eq(EXT4_I(dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
err = dquot_initialize(dir);
if (err)
return err;
@ -3492,6 +3495,11 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
int credits;
u8 old_file_type;
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
(!projid_eq(EXT4_I(new_dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
retval = dquot_initialize(old.dir);
if (retval)
return retval;
@ -3701,6 +3709,14 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
new.inode)))
return -EPERM;
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
!projid_eq(EXT4_I(new_dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)) ||
(ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
!projid_eq(EXT4_I(old_dir)->i_projid,
EXT4_I(new_dentry->d_inode)->i_projid)))
return -EXDEV;
retval = dquot_initialize(old.dir);
if (retval)
return retval;

97
fs/ext4/super.c
View File

@ -80,6 +80,36 @@ static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
/*
* Lock ordering
*
* Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
* i_mmap_rwsem (inode->i_mmap_rwsem)!
*
* page fault path:
* mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
* page lock -> i_data_sem (rw)
*
* buffered write path:
* sb_start_write -> i_mutex -> mmap_sem
* sb_start_write -> i_mutex -> transaction start -> page lock ->
* i_data_sem (rw)
*
* truncate:
* sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
* i_mmap_rwsem (w) -> page lock
* sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
* transaction start -> i_data_sem (rw)
*
* direct IO:
* sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
* sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
* transaction start -> i_data_sem (rw)
*
* writepages:
* transaction start -> page lock(s) -> i_data_sem (rw)
*/
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
static struct file_system_type ext2_fs_type = {
.owner = THIS_MODULE,
@ -958,6 +988,7 @@ static void init_once(void *foo)
INIT_LIST_HEAD(&ei->i_orphan);
init_rwsem(&ei->xattr_sem);
init_rwsem(&ei->i_data_sem);
init_rwsem(&ei->i_mmap_sem);
inode_init_once(&ei->vfs_inode);
}
@ -1066,8 +1097,8 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
}
#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
static int ext4_write_dquot(struct dquot *dquot);
static int ext4_acquire_dquot(struct dquot *dquot);
@ -1100,6 +1131,7 @@ static const struct dquot_operations ext4_quota_operations = {
.write_info = ext4_write_info,
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
.get_projid = ext4_get_projid,
};
static const struct quotactl_ops ext4_qctl_operations = {
@ -2526,6 +2558,12 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
"without CONFIG_QUOTA");
return 0;
}
if (ext4_has_feature_project(sb) && !readonly) {
ext4_msg(sb, KERN_ERR,
"Filesystem with project quota feature cannot be mounted RDWR "
"without CONFIG_QUOTA");
return 0;
}
#endif /* CONFIG_QUOTA */
return 1;
}
@ -3654,7 +3692,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sb->s_qcop = &dquot_quotactl_sysfile_ops;
else
sb->s_qcop = &ext4_qctl_operations;
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
#endif
memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
@ -4790,6 +4828,48 @@ restore_opts:
return err;
}
#ifdef CONFIG_QUOTA
static int ext4_statfs_project(struct super_block *sb,
kprojid_t projid, struct kstatfs *buf)
{
struct kqid qid;
struct dquot *dquot;
u64 limit;
u64 curblock;
qid = make_kqid_projid(projid);
dquot = dqget(sb, qid);
if (IS_ERR(dquot))
return PTR_ERR(dquot);
spin_lock(&dq_data_lock);
limit = (dquot->dq_dqb.dqb_bsoftlimit ?
dquot->dq_dqb.dqb_bsoftlimit :
dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
if (limit && buf->f_blocks > limit) {
curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
buf->f_blocks = limit;
buf->f_bfree = buf->f_bavail =
(buf->f_blocks > curblock) ?
(buf->f_blocks - curblock) : 0;
}
limit = dquot->dq_dqb.dqb_isoftlimit ?
dquot->dq_dqb.dqb_isoftlimit :
dquot->dq_dqb.dqb_ihardlimit;
if (limit && buf->f_files > limit) {
buf->f_files = limit;
buf->f_ffree =
(buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
(buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
}
spin_unlock(&dq_data_lock);
dqput(dquot);
return 0;
}
#endif
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
@ -4822,6 +4902,11 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
#ifdef CONFIG_QUOTA
if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
sb_has_quota_limits_enabled(sb, PRJQUOTA))
ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
#endif
return 0;
}
@ -4986,7 +5071,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
struct inode *qf_inode;
unsigned long qf_inums[EXT4_MAXQUOTAS] = {
le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
};
BUG_ON(!ext4_has_feature_quota(sb));
@ -5014,7 +5100,8 @@ static int ext4_enable_quotas(struct super_block *sb)
int type, err = 0;
unsigned long qf_inums[EXT4_MAXQUOTAS] = {
le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
};
sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;

2
fs/ext4/truncate.h
View File

@ -10,8 +10,10 @@
*/
static inline void ext4_truncate_failed_write(struct inode *inode)
{
down_write(&EXT4_I(inode)->i_mmap_sem);
truncate_inode_pages(inode->i_mapping, inode->i_size);
ext4_truncate(inode);
up_write(&EXT4_I(inode)->i_mmap_sem);
}
/*

2
include/trace/events/ext4.h
View File

@ -43,7 +43,7 @@ struct extent_status;
{ EXT4_GET_BLOCKS_METADATA_NOFAIL, "METADATA_NOFAIL" }, \
{ EXT4_GET_BLOCKS_NO_NORMALIZE, "NO_NORMALIZE" }, \
{ EXT4_GET_BLOCKS_KEEP_SIZE, "KEEP_SIZE" }, \
{ EXT4_GET_BLOCKS_NO_LOCK, "NO_LOCK" })
{ EXT4_GET_BLOCKS_ZERO, "ZERO" })
#define show_mflags(flags) __print_flags(flags, "", \
{ EXT4_MAP_NEW, "N" }, \

31
include/uapi/linux/fs.h
View File

@ -2,8 +2,11 @@
#define _UAPI_LINUX_FS_H
/*
* This file has definitions for some important file table
* structures etc.
* This file has definitions for some important file table structures
* and constants and structures used by various generic file system
* ioctl's. Please do not make any changes in this file before
* sending patches for review to linux-fsdevel@vger.kernel.org and
* linux-api@vger.kernel.org.
*/
#include <linux/limits.h>
@ -246,6 +249,23 @@ struct fsxattr {
/*
* Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
*
* Note: for historical reasons, these flags were originally used and
* defined for use by ext2/ext3, and then other file systems started
* using these flags so they wouldn't need to write their own version
* of chattr/lsattr (which was shipped as part of e2fsprogs). You
* should think twice before trying to use these flags in new
* contexts, or trying to assign these flags, since they are used both
* as the UAPI and the on-disk encoding for ext2/3/4. Also, we are
* almost out of 32-bit flags. :-)
*
* We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from
* XFS to the generic FS level interface. This uses a structure that
* has padding and hence has more room to grow, so it may be more
* appropriate for many new use cases.
*
* Please do not change these flags or interfaces before checking with
* linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org.
*/
#define FS_SECRM_FL 0x00000001 /* Secure deletion */
#define FS_UNRM_FL 0x00000002 /* Undelete */
@ -259,8 +279,8 @@ struct fsxattr {
#define FS_DIRTY_FL 0x00000100
#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
#define FS_ECOMPR_FL 0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */
#define FS_BTREE_FL 0x00001000 /* btree format dir */
#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
@ -268,9 +288,12 @@ struct fsxattr {
#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */
#define FS_EXTENT_FL 0x00080000 /* Extents */
#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
#define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */
#define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */
#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
#define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */
#define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */