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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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fs/f2fs/data.c
+9 -7
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 @@ repeat:
} 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;