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f2fs: set GFP_NOFS for grab_cache_page

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For normal inodes, their pages are allocated with __GFP_FS, which can cause
filesystem calls when reclaiming memory.
This can incur a dead lock condition accordingly.

So, this patch addresses this problem by introducing
f2fs_grab_cache_page(.., bool for_write), which calls
grab_cache_page_write_begin() with AOP_FLAG_NOFS.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-10-09 15:11:38 -07:00
parent 6e2c64ad7c
commit a56c7c6fb3
5 changed files with 28 additions and 18 deletions
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16
fs/f2fs/data.c
View file

@ -275,7 +275,8 @@ int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
return f2fs_reserve_block(dn, index);
}
struct page *get_read_data_page(struct inode *inode, pgoff_t index, int rw)
struct page *get_read_data_page(struct inode *inode, pgoff_t index,
int rw, bool for_write)
{
struct address_space *mapping = inode->i_mapping;
struct dnode_of_data dn;
@ -292,7 +293,7 @@ struct page *get_read_data_page(struct inode *inode, pgoff_t index, int rw)
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
return read_mapping_page(mapping, index, NULL);
page = grab_cache_page(mapping, index);
page = f2fs_grab_cache_page(mapping, index, for_write);
if (!page)
return ERR_PTR(-ENOMEM);
@ -352,7 +353,7 @@ struct page *find_data_page(struct inode *inode, pgoff_t index)
return page;
f2fs_put_page(page, 0);
page = get_read_data_page(inode, index, READ_SYNC);
page = get_read_data_page(inode, index, READ_SYNC, false);
if (IS_ERR(page))
return page;
@ -372,12 +373,13 @@ struct page *find_data_page(struct inode *inode, pgoff_t index)
* Because, the callers, functions in dir.c and GC, should be able to know
* whether this page exists or not.
*/
struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
struct page *get_lock_data_page(struct inode *inode, pgoff_t index,
bool for_write)
{
struct address_space *mapping = inode->i_mapping;
struct page *page;
repeat:
page = get_read_data_page(inode, index, READ_SYNC);
page = get_read_data_page(inode, index, READ_SYNC, for_write);
if (IS_ERR(page))
return page;
@ -411,7 +413,7 @@ struct page *get_new_data_page(struct inode *inode,
struct dnode_of_data dn;
int err;
repeat:
page = grab_cache_page(mapping, index);
page = f2fs_grab_cache_page(mapping, index, true);
if (!page) {
/*
* before exiting, we should make sure ipage will be released
@ -439,7 +441,7 @@ struct page *get_new_data_page(struct inode *inode,
} else {
f2fs_put_page(page, 1);
page = get_read_data_page(inode, index, READ_SYNC);
page = get_read_data_page(inode, index, READ_SYNC, true);
if (IS_ERR(page))
goto repeat;

6
fs/f2fs/dir.c
View file

@ -258,7 +258,7 @@ struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
if (f2fs_has_inline_dentry(dir))
return f2fs_parent_inline_dir(dir, p);
page = get_lock_data_page(dir, 0);
page = get_lock_data_page(dir, 0, false);
if (IS_ERR(page))
return NULL;
@ -740,7 +740,7 @@ bool f2fs_empty_dir(struct inode *dir)
return f2fs_empty_inline_dir(dir);
for (bidx = 0; bidx < nblock; bidx++) {
dentry_page = get_lock_data_page(dir, bidx);
dentry_page = get_lock_data_page(dir, bidx, false);
if (IS_ERR(dentry_page)) {
if (PTR_ERR(dentry_page) == -ENOENT)
continue;
@ -854,7 +854,7 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
for (; n < npages; n++) {
dentry_page = get_lock_data_page(inode, n);
dentry_page = get_lock_data_page(inode, n, false);
if (IS_ERR(dentry_page))
continue;

12
fs/f2fs/f2fs.h
View file

@ -1233,6 +1233,14 @@ static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)
return sbi->total_valid_inode_count;
}
static inline struct page *f2fs_grab_cache_page(struct address_space *mapping,
pgoff_t index, bool for_write)
{
if (!for_write)
return grab_cache_page(mapping, index);
return grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
}
static inline void f2fs_copy_page(struct page *src, struct page *dst)
{
char *src_kaddr = kmap(src);
@ -1831,9 +1839,9 @@ void set_data_blkaddr(struct dnode_of_data *);
int reserve_new_block(struct dnode_of_data *);
int f2fs_get_block(struct dnode_of_data *, pgoff_t);
int f2fs_reserve_block(struct dnode_of_data *, pgoff_t);
struct page *get_read_data_page(struct inode *, pgoff_t, int);
struct page *get_read_data_page(struct inode *, pgoff_t, int, bool);
struct page *find_data_page(struct inode *, pgoff_t);
struct page *get_lock_data_page(struct inode *, pgoff_t);
struct page *get_lock_data_page(struct inode *, pgoff_t, bool);
struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
int do_write_data_page(struct f2fs_io_info *);
int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *, u64, u64);

6
fs/f2fs/file.c
View file

@ -505,14 +505,14 @@ static int truncate_partial_data_page(struct inode *inode, u64 from,
return 0;
if (cache_only) {
page = grab_cache_page(mapping, index);
page = f2fs_grab_cache_page(mapping, index, false);
if (page && PageUptodate(page))
goto truncate_out;
f2fs_put_page(page, 1);
return 0;
}
page = get_lock_data_page(inode, index);
page = get_lock_data_page(inode, index, true);
if (IS_ERR(page))
return 0;
truncate_out:
@ -879,7 +879,7 @@ static int __exchange_data_block(struct inode *inode, pgoff_t src,
} else {
struct page *psrc, *pdst;
psrc = get_lock_data_page(inode, src);
psrc = get_lock_data_page(inode, src, true);
if (IS_ERR(psrc))
return PTR_ERR(psrc);
pdst = get_new_data_page(inode, NULL, dst, false);

6
fs/f2fs/gc.c
View file

@ -550,7 +550,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx)
int err;
/* do not read out */
page = grab_cache_page(inode->i_mapping, bidx);
page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
if (!page)
return;
@ -620,7 +620,7 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type)
{
struct page *page;
page = get_lock_data_page(inode, bidx);
page = get_lock_data_page(inode, bidx, true);
if (IS_ERR(page))
return;
@ -714,7 +714,7 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
start_bidx = start_bidx_of_node(nofs, F2FS_I(inode));
data_page = get_read_data_page(inode,
start_bidx + ofs_in_node, READA);
start_bidx + ofs_in_node, READA, true);
if (IS_ERR(data_page)) {
iput(inode);
continue;